31628406172 has 24 divisors (see below), whose sum is σ = 60496998912. Its totient is φ = 14349049200.

The previous prime is 31628406151. The next prime is 31628406191. The reversal of 31628406172 is 27160482613.

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, 664204 + ... + 710227.

It is an arithmetic number, because the mean of its divisors is an integer number (2520708288).

Almost surely, 2^31628406172 is an apocalyptic number.

It is an amenable number.

31628406172 is a deficient number, since it is larger than the sum of its proper divisors (28868592740).

31628406172 is a wasteful number, since it uses less digits than its factorization.

31628406172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374969 (or 1374967 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 31628406172 its reverse (27160482613), we get a palindrome (58788888785).

The spelling of 31628406172 in words is "thirty-one billion, six hundred twenty-eight million, four hundred six thousand, one hundred seventy-two".