31220640054 has 32 divisors (see below), whose sum is σ = 69643031040. Its totient is φ = 10367305416.

The previous prime is 31220640049. The next prime is 31220640067. The reversal of 31220640054 is 45004602213.

31220640054 is a `hidden beast` number, since 3 + 1 + 2 + 206 + 400 + 54 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1084962 + ... + 1113365.

It is an arithmetic number, because the mean of its divisors is an integer number (2176344720).

Almost surely, 2^31220640054 is an apocalyptic number.

31220640054 is an abundant number, since it is smaller than the sum of its proper divisors (38422390986).

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

31220640054 is a wasteful number, since it uses less digits than its factorization.

31220640054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198601 (or 2198595 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 31220640054 in words is "thirty-one billion, two hundred twenty million, six hundred forty thousand, fifty-four".