31680746280 has 48 divisors (see below), whose sum is σ = 102962426580. Its totient is φ = 8448198912.

The previous prime is 31680746261. The next prime is 31680746297. The reversal of 31680746280 is 8264708613.

31680746280 is a `hidden beast` number, since 3 + 16 + 8 + 0 + 7 + 4 + 628 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30177943524 + 1502802756 = 173718^2 + 38766^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 11 ways as a sum of consecutive naturals, for example, 44000677 + ... + 44001396.

Almost surely, 2^31680746280 is an apocalyptic number.

31680746280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31680746280 is an abundant number, since it is smaller than the sum of its proper divisors (71281680300).

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

31680746280 is a wasteful number, since it uses less digits than its factorization.

31680746280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88002090 (or 88002083 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 31680746280 in words is "thirty-one billion, six hundred eighty million, seven hundred forty-six thousand, two hundred eighty".