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99720639 = 3815199
BaseRepresentation
bin1011111000110…
…01110110111111
320221122100000000
411330121312333
5201012030024
613521205343
72320416504
oct574316677
9227570000
1099720639
1151320657
1229490853
13178765c5
14d35b4ab
158b4bcc9
hex5f19dbf

99720639 has 18 divisors (see below), whose sum is σ = 149583200. Its totient is φ = 66476052.

The previous prime is 99720637. The next prime is 99720653. The reversal of 99720639 is 93602799.

99720639 is a `hidden beast` number, since 9 + 9 + 7 + 2 + 0 + 639 = 666.

It is not a de Polignac number, because 99720639 - 21 = 99720637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99720594 and 99720603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99720631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1039 + ... + 14160.

Almost surely, 299720639 is an apocalyptic number.

99720639 is a deficient number, since it is larger than the sum of its proper divisors (49862561).

99720639 is an frugal number, since it uses more digits than its factorization.

99720639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15223 (or 15202 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 99720639 is about 9986.0221810288. The cubic root of 99720639 is about 463.7262539455.

The spelling of 99720639 in words is "ninety-nine million, seven hundred twenty thousand, six hundred thirty-nine".

Divisors: 1 3 9 27 81 243 729 2187 6561 15199 45597 136791 410373 1231119 3693357 11080071 33240213 99720639