31287605420 has 24 divisors (see below), whose sum is σ = 65729774544. Its totient is φ = 12510127296.

The previous prime is 31287605417. The next prime is 31287605431. The reversal of 31287605420 is 2450678213.

It is a happy number.

It is a super-2 number, since 2×31287605420² (a number of 22 digits) contains 22 as substring.

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, 254762 + ... + 357041.

It is an arithmetic number, because the mean of its divisors is an integer number (2738740606).

Almost surely, 2^31287605420 is an apocalyptic number.

It is an amenable number.

31287605420 is an abundant number, since it is smaller than the sum of its proper divisors (34442169124).

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

31287605420 is a wasteful number, since it uses less digits than its factorization.

31287605420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614369 (or 614367 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 31287605420 in words is "thirty-one billion, two hundred eighty-seven million, six hundred five thousand, four hundred twenty".