31316994720 has 576 divisors, whose sum is σ = 129960754560. Its totient is φ = 6768230400.

The previous prime is 31316994707. The next prime is 31316994733. The reversal of 31316994720 is 2749961313.

31316994720 is a `hidden beast` number, since 3 + 13 + 169 + 9 + 472 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (31316994707) and next prime (31316994733).

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5113260 + ... + 5119380.

It is an arithmetic number, because the mean of its divisors is an integer number (225626310).

Almost surely, 2^31316994720 is an apocalyptic number.

31316994720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31316994720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64980377280).

31316994720 is an abundant number, since it is smaller than the sum of its proper divisors (98643759840).

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

31316994720 is a wasteful number, since it uses less digits than its factorization.

31316994720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6189 (or 6178 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 31316994720 in words is "thirty-one billion, three hundred sixteen million, nine hundred ninety-four thousand, seven hundred twenty".