331778328 has 64 divisors (see below), whose sum is σ = 980640000. Its totient is φ = 91523712.

The previous prime is 331778303. The next prime is 331778351. The reversal of 331778328 is 823877133.

It is a super-2 number, since 2×331778328² = 220153717860951168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 331778328.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29178 + ... + 38921.

It is an arithmetic number, because the mean of its divisors is an integer number (15322500).

Almost surely, 2^331778328 is an apocalyptic number.

It is an amenable number.

331778328 is an abundant number, since it is smaller than the sum of its proper divisors (648861672).

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

331778328 is a wasteful number, since it uses less digits than its factorization.

331778328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68144 (or 68140 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 331778328 is about 18214.7832268188. The cubic root of 331778328 is about 692.2814129360.

The spelling of 331778328 in words is "three hundred thirty-one million, seven hundred seventy-eight thousand, three hundred twenty-eight".