25890287538 has 16 divisors (see below), whose sum is σ = 51806119680. Its totient is φ = 8625838416.

The previous prime is 25890287497. The next prime is 25890287551. The reversal of 25890287538 is 83578209852.

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 7 ways as a sum of consecutive naturals, for example, 1051170 + ... + 1075517.

It is an arithmetic number, because the mean of its divisors is an integer number (3237882480).

Almost surely, 2^25890287538 is an apocalyptic number.

25890287538 is an abundant number, since it is smaller than the sum of its proper divisors (25915832142).

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

25890287538 is a wasteful number, since it uses less digits than its factorization.

25890287538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128721.

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 25890287538 in words is "twenty-five billion, eight hundred ninety million, two hundred eighty-seven thousand, five hundred thirty-eight".