331620 has 24 divisors (see below), whose sum is σ = 928704. Its totient is φ = 88416.

The previous prime is 331613. The next prime is 331651. The reversal of 331620 is 26133.

331620 is nontrivially palindromic in base 7.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 331620.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331620.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2704 + ... + 2823.

It is an arithmetic number, because the mean of its divisors is an integer number (38696).

2³³¹⁶²⁰ is an apocalyptic number.

331620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331620 is an abundant number, since it is smaller than the sum of its proper divisors (597084).

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

331620 is a wasteful number, since it uses less digits than its factorization.

331620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5539 (or 5537 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 331620 is about 575.8645674115. The cubic root of 331620 is about 69.2171274165.

Adding to 331620 its reverse (26133), we get a palindrome (357753).

It can be divided in two parts, 33 and 1620, that added together give a triangular number (1653 = T₅₇).

The spelling of 331620 in words is "three hundred thirty-one thousand, six hundred twenty".