31303264640 has 32 divisors (see below), whose sum is σ = 74834368560. Its totient is φ = 12521305600.

The previous prime is 31303264631. The next prime is 31303264667. The reversal of 31303264640 is 4646230313.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 31303264597 and 31303264606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24455036 + ... + 24456315.

Almost surely, 2^31303264640 is an apocalyptic number.

It is an amenable number.

31303264640 is an abundant number, since it is smaller than the sum of its proper divisors (43531103920).

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

31303264640 is an equidigital number, since it uses as much as digits as its factorization.

31303264640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48911370 (or 48911358 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 32.

Adding to 31303264640 its reverse (4646230313), we get a palindrome (35949494953).

The spelling of 31303264640 in words is "thirty-one billion, three hundred three million, two hundred sixty-four thousand, six hundred forty".