31989360 has 80 divisors (see below), whose sum is σ = 106805664. Its totient is φ = 7873536.

The previous prime is 31989341. The next prime is 31989361. The reversal of 31989360 is 6398913.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31989361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2007 + ... + 8246.

Almost surely, 2^31989360 is an apocalyptic number.

31989360 is a gapful number since it is divisible by the number (30) 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 31989360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53402832).

31989360 is an abundant number, since it is smaller than the sum of its proper divisors (74816304).

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

31989360 is a wasteful number, since it uses less digits than its factorization.

31989360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10282 (or 10276 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 31989360 is about 5655.9137192853. The cubic root of 31989360 is about 317.4450191030.

The spelling of 31989360 in words is "thirty-one million, nine hundred eighty-nine thousand, three hundred sixty".