31387142970 has 96 divisors (see below), whose sum is σ = 85243826304. Its totient is φ = 7997616000.

The previous prime is 31387142923. The next prime is 31387143059. The reversal of 31387142970 is 7924178313.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2106045 + ... + 2120895.

It is an arithmetic number, because the mean of its divisors is an integer number (887956524).

Almost surely, 2^31387142970 is an apocalyptic number.

31387142970 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31387142970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42621913152).

31387142970 is an abundant number, since it is smaller than the sum of its proper divisors (53856683334).

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

31387142970 is a wasteful number, since it uses less digits than its factorization.

31387142970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15908 (or 15905 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 31387142970 in words is "thirty-one billion, three hundred eighty-seven million, one hundred forty-two thousand, nine hundred seventy".