31607388646 has 4 divisors (see below), whose sum is σ = 47411082972. Its totient is φ = 15803694322.

The previous prime is 31607388587. The next prime is 31607388667. The reversal of 31607388646 is 64688370613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 31607388593 and 31607388602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7901847160 + ... + 7901847163.

It is an arithmetic number, because the mean of its divisors is an integer number (11852770743).

Almost surely, 2^31607388646 is an apocalyptic number.

31607388646 is a deficient number, since it is larger than the sum of its proper divisors (15803694326).

31607388646 is a wasteful number, since it uses less digits than its factorization.

31607388646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15803694325.

The product of its (nonzero) digits is 3483648, while the sum is 52.

The spelling of 31607388646 in words is "thirty-one billion, six hundred seven million, three hundred eighty-eight thousand, six hundred forty-six".