331607628 has 48 divisors (see below), whose sum is σ = 937883520. Its totient is φ = 100486800.

The previous prime is 331607623. The next prime is 331607657. The reversal of 331607628 is 826706133.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 331607592 and 331607601.

It is not an unprimeable number, because it can be changed into a prime (331607623) 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, 138378 + ... + 140753.

It is an arithmetic number, because the mean of its divisors is an integer number (19539240).

Almost surely, 2^331607628 is an apocalyptic number.

It is an amenable number.

331607628 is an abundant number, since it is smaller than the sum of its proper divisors (606275892).

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

331607628 is a wasteful number, since it uses less digits than its factorization.

331607628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279155 (or 279147 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 331607628 is about 18210.0968695941. The cubic root of 331607628 is about 692.1626662713.

The spelling of 331607628 in words is "three hundred thirty-one million, six hundred seven thousand, six hundred twenty-eight".