31801336380 has 72 divisors (see below), whose sum is σ = 105233519664. Its totient is φ = 7709414400.

The previous prime is 31801336351. The next prime is 31801336381. The reversal of 31801336380 is 8363310813.

31801336380 is a `hidden beast` number, since 3 + 1 + 8 + 0 + 13 + 3 + 638 + 0 = 666.

It is a super-2 number, since 2×31801336380² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31801336381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8028661 + ... + 8032620.

It is an arithmetic number, because the mean of its divisors is an integer number (1461576662).

Almost surely, 2^31801336380 is an apocalyptic number.

31801336380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31801336380 is an abundant number, since it is smaller than the sum of its proper divisors (73432183284).

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

31801336380 is a wasteful number, since it uses less digits than its factorization.

31801336380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16061307 (or 16061302 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 31801336380 in words is "thirty-one billion, eight hundred one million, three hundred thirty-six thousand, three hundred eighty".