31644779406 has 16 divisors (see below), whose sum is σ = 63610827984. Its totient is φ = 10494714944.

The previous prime is 31644779389. The next prime is 31644779431. The reversal of 31644779406 is 60497744613.

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, 13384935 + ... + 13387298.

It is an arithmetic number, because the mean of its divisors is an integer number (3975676749).

Almost surely, 2^31644779406 is an apocalyptic number.

31644779406 is an abundant number, since it is smaller than the sum of its proper divisors (31966048578).

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

31644779406 is a wasteful number, since it uses less digits than its factorization.

31644779406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26772435.

The product of its (nonzero) digits is 3048192, while the sum is 51.

The spelling of 31644779406 in words is "thirty-one billion, six hundred forty-four million, seven hundred seventy-nine thousand, four hundred six".