31125464720 has 80 divisors (see below), whose sum is σ = 84060715008. Its totient is φ = 10496632320.

The previous prime is 31125464687. The next prime is 31125464729. The reversal of 31125464720 is 2746452113.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (31125464729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421424 + ... + 489743.

Almost surely, 2^31125464720 is an apocalyptic number.

It is an amenable number.

31125464720 is an abundant number, since it is smaller than the sum of its proper divisors (52935250288).

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

31125464720 is a wasteful number, since it uses less digits than its factorization.

31125464720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911248 (or 911242 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 31125464720 in words is "thirty-one billion, one hundred twenty-five million, four hundred sixty-four thousand, seven hundred twenty".