25438402488 has 32 divisors (see below), whose sum is σ = 63832438800. Its totient is φ = 8447943168.

The previous prime is 25438402441. The next prime is 25438402501. The reversal of 25438402488 is 88420483452.

It is a super-2 number, since 2×25438402488² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1963681 + ... + 1976592.

Almost surely, 2^25438402488 is an apocalyptic number.

It is an amenable number.

25438402488 is an abundant number, since it is smaller than the sum of its proper divisors (38394036312).

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

25438402488 is a wasteful number, since it uses less digits than its factorization.

25438402488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940551 (or 3940547 counting only the distinct ones).

The product of its (nonzero) digits is 1966080, while the sum is 48.

The spelling of 25438402488 in words is "twenty-five billion, four hundred thirty-eight million, four hundred two thousand, four hundred eighty-eight".