25690631990 has 16 divisors (see below), whose sum is σ = 46271729520. Its totient is φ = 10269899040.

The previous prime is 25690631987. The next prime is 25690632017. The reversal of 25690631990 is 9913609652.

It is a super-2 number, since 2×25690631990² (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, 777221 + ... + 809600.

It is an arithmetic number, because the mean of its divisors is an integer number (2891983095).

Almost surely, 2^25690631990 is an apocalyptic number.

25690631990 is a deficient number, since it is larger than the sum of its proper divisors (20581097530).

25690631990 is a wasteful number, since it uses less digits than its factorization.

25690631990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588447.

The product of its (nonzero) digits is 787320, while the sum is 50.

The spelling of 25690631990 in words is "twenty-five billion, six hundred ninety million, six hundred thirty-one thousand, nine hundred ninety".