31872916420 has 24 divisors (see below), whose sum is σ = 67067280000. Its totient is φ = 12723613152.

The previous prime is 31872916373. The next prime is 31872916421. The reversal of 31872916420 is 2461927813.

It is a super-2 number, since 2×31872916420² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31872916421) 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 7 ways as a sum of consecutive naturals, for example, 1586860 + ... + 1606819.

It is an arithmetic number, because the mean of its divisors is an integer number (2794470000).

Almost surely, 2^31872916420 is an apocalyptic number.

It is an amenable number.

31872916420 is an abundant number, since it is smaller than the sum of its proper divisors (35194363580).

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

31872916420 is a wasteful number, since it uses less digits than its factorization.

31872916420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194187 (or 3194185 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 31872916420 in words is "thirty-one billion, eight hundred seventy-two million, nine hundred sixteen thousand, four hundred twenty".