31520960 has 56 divisors (see below), whose sum is σ = 75712320. Its totient is φ = 12498944.

The previous prime is 31520959. The next prime is 31520977. The reversal of 31520960 is 6902513.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43481 + ... + 44199.

Almost surely, 2^31520960 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31520960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37856160).

31520960 is an abundant number, since it is smaller than the sum of its proper divisors (44191360).

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

31520960 is a wasteful number, since it uses less digits than its factorization.

31520960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 31520960 is about 5614.3530348563. The cubic root of 31520960 is about 315.8880124457. Note that the first 3 decimals are identical.

The spelling of 31520960 in words is "thirty-one million, five hundred twenty thousand, nine hundred sixty".