331478240 has 48 divisors (see below), whose sum is σ = 829189872. Its totient is φ = 124790784.

The previous prime is 331478201. The next prime is 331478243. The reversal of 331478240 is 42874133.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 331478197 and 331478206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331478243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58214 + ... + 63653.

It is an arithmetic number, because the mean of its divisors is an integer number (17274789).

Almost surely, 2^331478240 is an apocalyptic number.

It is an amenable number.

331478240 is an abundant number, since it is smaller than the sum of its proper divisors (497711632).

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

331478240 is a wasteful number, since it uses less digits than its factorization.

331478240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121899 (or 121891 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 331478240 is about 18206.5438785070. The cubic root of 331478240 is about 692.0726309545.

The spelling of 331478240 in words is "three hundred thirty-one million, four hundred seventy-eight thousand, two hundred forty".