31768638 has 16 divisors (see below), whose sum is σ = 69313536. Its totient is φ = 9626840.

The previous prime is 31768637. The next prime is 31768657. The reversal of 31768638 is 83686713.

It is a self number, because there is not a number n which added to its sum of digits gives 31768638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31768637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240606 + ... + 240737.

It is an arithmetic number, because the mean of its divisors is an integer number (4332096).

Almost surely, 2^31768638 is an apocalyptic number.

31768638 is an abundant number, since it is smaller than the sum of its proper divisors (37544898).

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

31768638 is a wasteful number, since it uses less digits than its factorization.

31768638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481359.

The product of its digits is 145152, while the sum is 42.

The square root of 31768638 is about 5636.3674472128. The cubic root of 31768638 is about 316.7132250411.

The spelling of 31768638 in words is "thirty-one million, seven hundred sixty-eight thousand, six hundred thirty-eight".