25426490728 has 16 divisors (see below), whose sum is σ = 47681302500. Its totient is φ = 12711476736.

The previous prime is 25426490717. The next prime is 25426490779. The reversal of 25426490728 is 82709462452.

It can be written as a sum of positive squares in 2 ways, for example, as 24704923684 + 721567044 = 157178^2 + 26862^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 158953 + ... + 275896.

Almost surely, 2^25426490728 is an apocalyptic number.

It is an amenable number.

25426490728 is a deficient number, since it is larger than the sum of its proper divisors (22254811772).

25426490728 is a wasteful number, since it uses less digits than its factorization.

25426490728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442164 (or 442160 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 25426490728 in words is "twenty-five billion, four hundred twenty-six million, four hundred ninety thousand, seven hundred twenty-eight".