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28438608061 = 151118821051
BaseRepresentation
bin11010011111000100…
…101011100010111101
32201101221020222022001
4122133010223202331
5431220240424221
621021534022301
72024510115523
oct323704534275
981357228261
1028438608061
1111073942176
125618047991
1328b2a59446
14153ad24313
15b16a04391
hex69f12b8bd

28438608061 has 4 divisors (see below), whose sum is σ = 28457430624. Its totient is φ = 28419785500.

The previous prime is 28438608047. The next prime is 28438608071. The reversal of 28438608061 is 16080683482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28438608061 - 215 = 28438575293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438608071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9409015 + ... + 9412036.

It is an arithmetic number, because the mean of its divisors is an integer number (7114357656).

Almost surely, 228438608061 is an apocalyptic number.

It is an amenable number.

28438608061 is a deficient number, since it is larger than the sum of its proper divisors (18822563).

28438608061 is a wasteful number, since it uses less digits than its factorization.

28438608061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18822562.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 28438608061 in words is "twenty-eight billion, four hundred thirty-eight million, six hundred eight thousand, sixty-one".

Divisors: 1 1511 18821051 28438608061