31725232638 has 32 divisors (see below), whose sum is σ = 69932298240. Its totient is φ = 9514594560.

The previous prime is 31725232633. The next prime is 31725232657. The reversal of 31725232638 is 83623252713.

It is a self number, because there is not a number n which added to its sum of digits gives 31725232638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31725232633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2471358 + ... + 2484161.

It is an arithmetic number, because the mean of its divisors is an integer number (2185384320).

Almost surely, 2^31725232638 is an apocalyptic number.

31725232638 is an abundant number, since it is smaller than the sum of its proper divisors (38207065602).

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

31725232638 is a wasteful number, since it uses less digits than its factorization.

31725232638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4955632.

The product of its digits is 362880, while the sum is 42.

The spelling of 31725232638 in words is "thirty-one billion, seven hundred twenty-five million, two hundred thirty-two thousand, six hundred thirty-eight".