31071440664 has 48 divisors (see below), whose sum is σ = 91801986120. Its totient is φ = 9415587840.

The previous prime is 31071440657. The next prime is 31071440689. The reversal of 31071440664 is 46604417013.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19615017 + ... + 19616600.

Almost surely, 2^31071440664 is an apocalyptic number.

It is an amenable number.

31071440664 is an abundant number, since it is smaller than the sum of its proper divisors (60730545456).

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

31071440664 is a wasteful number, since it uses less digits than its factorization.

31071440664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39231640 (or 39231633 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

Adding to 31071440664 its reverse (46604417013), we get a palindrome (77675857677).

The spelling of 31071440664 in words is "thirty-one billion, seventy-one million, four hundred forty thousand, six hundred sixty-four".