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99578744721 = 3229323592
BaseRepresentation
bin101110010111101011…
…0110000111110010001
3100112000210222100122100
41130233112300332101
53112414124312341
6113425034031013
710123440236001
oct1345726607621
9315023870570
1099578744721
113925a672845
1217370878469
13950c468571
144b69126001
1528cc2783b6
hex172f5b0f91

99578744721 has 27 divisors (see below), whose sum is σ = 144731697019. Its totient is φ = 65974969392.

The previous prime is 99578744719. The next prime is 99578744729. The reversal of 99578744721 is 12744787599.

The square root of 99578744721 is 315561.

It is a perfect power (a square), and thus also a powerful number.

99578744721 is a `hidden beast` number, since 9 + 95 + 7 + 8 + 74 + 472 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 94215233025 + 5363511696 = 306945^2 + 73236^2 .

It is not a de Polignac number, because 99578744721 - 21 = 99578744719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99578744729) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 277377940 + ... + 277378298.

Almost surely, 299578744721 is an apocalyptic number.

99578744721 is the 315561-st square number.

99578744721 is the 157781-st centered octagonal number.

It is an amenable number.

99578744721 is a deficient number, since it is larger than the sum of its proper divisors (45152952298).

99578744721 is an frugal number, since it uses more digits than its factorization.

99578744721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 655 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 99578744721 in words is "ninety-nine billion, five hundred seventy-eight million, seven hundred forty-four thousand, seven hundred twenty-one".

Divisors: 1 3 9 293 359 879 1077 2637 3231 85849 105187 128881 257547 315561 386643 772641 946683 1159929 30819791 37762133 92459373 113286399 277378119 339859197 11064304969 33192914907 99578744721