31119806628 has 18 divisors (see below), whose sum is σ = 78663955734. Its totient is φ = 10373268864.

The previous prime is 31119806611. The next prime is 31119806651. The reversal of 31119806628 is 82660891113.

31119806628 is a `hidden beast` number, since 3 + 1 + 1 + 19 + 8 + 0 + 6 + 628 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26804893284 + 4314913344 = 163722^2 + 65688^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×31119806628² (a number of 22 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 432219501 + ... + 432219572.

It is an arithmetic number, because the mean of its divisors is an integer number (4370219763).

Almost surely, 2^31119806628 is an apocalyptic number.

It is an amenable number.

31119806628 is an abundant number, since it is smaller than the sum of its proper divisors (47544149106).

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

31119806628 is a wasteful number, since it uses less digits than its factorization.

31119806628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864439083 (or 864439078 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 31119806628 in words is "thirty-one billion, one hundred nineteen million, eight hundred six thousand, six hundred twenty-eight".