331402320 has 80 divisors (see below), whose sum is σ = 1141504320. Its totient is φ = 88373376.

The previous prime is 331402319. The next prime is 331402349. The reversal of 331402320 is 23204133.

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 (18).

It is a junction number, because it is equal to n+sod(n) for n = 331402293 and 331402302.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 74554 + ... + 78873.

It is an arithmetic number, because the mean of its divisors is an integer number (14268804).

Almost surely, 2^331402320 is an apocalyptic number.

331402320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331402320 is an abundant number, since it is smaller than the sum of its proper divisors (810102000).

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

331402320 is a wasteful number, since it uses less digits than its factorization.

331402320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153449 (or 153437 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 331402320 is about 18204.4587944822. The cubic root of 331402320 is about 692.0197907178.

Adding to 331402320 its reverse (23204133), we get a palindrome (354606453).

The spelling of 331402320 in words is "three hundred thirty-one million, four hundred two thousand, three hundred twenty".