31909418748 has 96 divisors (see below), whose sum is σ = 87182144000. Its totient is φ = 10065098880.

The previous prime is 31909418731. The next prime is 31909418789. The reversal of 31909418748 is 84781490913.

It is a super-2 number, since 2×31909418748² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 31909418694 and 31909418703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1877328 + ... + 1894248.

Almost surely, 2^31909418748 is an apocalyptic number.

31909418748 is a gapful number since it is divisible by the number (38) 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 31909418748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43591072000).

31909418748 is an abundant number, since it is smaller than the sum of its proper divisors (55272725252).

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

31909418748 is a wasteful number, since it uses less digits than its factorization.

31909418748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17872 (or 17864 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 31909418748 in words is "thirty-one billion, nine hundred nine million, four hundred eighteen thousand, seven hundred forty-eight".