31305996 has 72 divisors (see below), whose sum is σ = 85620080. Its totient is φ = 9611136.

The previous prime is 31305973. The next prime is 31306031. The reversal of 31305996 is 69950313.

31305996 is a `hidden beast` number, since 31 + 30 + 599 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31305996.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24690 + ... + 25926.

Almost surely, 2^31305996 is an apocalyptic number.

31305996 is a gapful number since it is divisible by the number (36) 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 31305996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42810040).

31305996 is an abundant number, since it is smaller than the sum of its proper divisors (54314084).

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

31305996 is a wasteful number, since it uses less digits than its factorization.

31305996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303 (or 1298 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 36.

The square root of 31305996 is about 5595.1761366377. The cubic root of 31305996 is about 315.1682849853.

The spelling of 31305996 in words is "thirty-one million, three hundred five thousand, nine hundred ninety-six".