331321620 has 96 divisors (see below), whose sum is σ = 1116057600. Its totient is φ = 71743104.

The previous prime is 331321597. The next prime is 331321621. The reversal of 331321620 is 26123133.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331321621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12780 + ... + 28739.

It is an arithmetic number, because the mean of its divisors is an integer number (11625600).

Almost surely, 2^331321620 is an apocalyptic number.

331321620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331321620 is an abundant number, since it is smaller than the sum of its proper divisors (784735980).

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

331321620 is a wasteful number, since it uses less digits than its factorization.

331321620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41557 (or 41555 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 331321620 is about 18202.2421695790. The cubic root of 331321620 is about 691.9636147575.

Adding to 331321620 its reverse (26123133), we get a palindrome (357444753).

The spelling of 331321620 in words is "three hundred thirty-one million, three hundred twenty-one thousand, six hundred twenty".