31620930 has 96 divisors (see below), whose sum is σ = 86413824. Its totient is φ = 7392000.

The previous prime is 31620871. The next prime is 31620931. The reversal of 31620930 is 3902613.

It is a self number, because there is not a number n which added to its sum of digits gives 31620930.

It is not an unprimeable number, because it can be changed into a prime (31620931) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112390 + ... + 112670.

It is an arithmetic number, because the mean of its divisors is an integer number (900144).

Almost surely, 2^31620930 is an apocalyptic number.

31620930 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31620930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43206912).

31620930 is an abundant number, since it is smaller than the sum of its proper divisors (54792894).

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

31620930 is a wasteful number, since it uses less digits than its factorization.

31620930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 31620930 is about 5623.2490608188. The cubic root of 31620930 is about 316.2216105581.

The spelling of 31620930 in words is "thirty-one million, six hundred twenty thousand, nine hundred thirty".