25705250928 has 120 divisors (see below), whose sum is σ = 87052294368. Its totient is φ = 6912331776.

The previous prime is 25705250903. The next prime is 25705250969. The reversal of 25705250928 is 82905250752.

25705250928 is a `hidden beast` number, since 2 + 5 + 70 + 52 + 509 + 28 = 666.

It is a super-2 number, since 2×25705250928² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 732901 + ... + 767172.

Almost surely, 2^25705250928 is an apocalyptic number.

25705250928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25705250928 is an abundant number, since it is smaller than the sum of its proper divisors (61347043440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25705250928 is a wasteful number, since it uses less digits than its factorization.

25705250928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500111 (or 1500102 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 25705250928 in words is "twenty-five billion, seven hundred five million, two hundred fifty thousand, nine hundred twenty-eight".