25729928 has 16 divisors (see below), whose sum is σ = 55135680. Its totient is φ = 11027088.

The previous prime is 25729927. The next prime is 25729981. The reversal of 25729928 is 82992752.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (25729927) 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, 229676 + ... + 229787.

It is an arithmetic number, because the mean of its divisors is an integer number (3445980).

Almost surely, 2^25729928 is an apocalyptic number.

25729928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25729928 is an abundant number, since it is smaller than the sum of its proper divisors (29405752).

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

25729928 is a wasteful number, since it uses less digits than its factorization.

25729928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459476 (or 459472 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 25729928 is about 5072.4676440565. The cubic root of 25729928 is about 295.2202817028.

The spelling of 25729928 in words is "twenty-five million, seven hundred twenty-nine thousand, nine hundred twenty-eight".