31381952280 has 64 divisors (see below), whose sum is σ = 107595267840. Its totient is φ = 7173017472.

The previous prime is 31381952279. The next prime is 31381952317. The reversal of 31381952280 is 8225918313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18678894 + ... + 18680573.

It is an arithmetic number, because the mean of its divisors is an integer number (1681176060).

Almost surely, 2^31381952280 is an apocalyptic number.

31381952280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31381952280 is an abundant number, since it is smaller than the sum of its proper divisors (76213315560).

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

31381952280 is a wasteful number, since it uses less digits than its factorization.

31381952280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37359488 (or 37359484 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 31381952280 in words is "thirty-one billion, three hundred eighty-one million, nine hundred fifty-two thousand, two hundred eighty".