31427975808 has 128 divisors (see below), whose sum is σ = 92878833600. Its totient is φ = 10462141440.

The previous prime is 31427975807. The next prime is 31427975827. The reversal of 31427975808 is 80857972413.

It is a happy number.

31427975808 is a `hidden beast` number, since 31 + 4 + 27 + 9 + 7 + 580 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (31427975807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2797210 + ... + 2808422.

Almost surely, 2^31427975808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31427975808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46439416800).

31427975808 is an abundant number, since it is smaller than the sum of its proper divisors (61450857792).

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

31427975808 is a wasteful number, since it uses less digits than its factorization.

31427975808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12047 (or 12029 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 31427975808 in words is "thirty-one billion, four hundred twenty-seven million, nine hundred seventy-five thousand, eight hundred eight".