321978628 has 12 divisors (see below), whose sum is σ = 564330060. Its totient is φ = 160741472.

The previous prime is 321978581. The next prime is 321978637. The reversal of 321978628 is 826879123.

It can be written as a sum of positive squares in 2 ways, for example, as 153809604 + 168169024 = 12402^2 + 12968^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59023 + ... + 64246.

It is an arithmetic number, because the mean of its divisors is an integer number (47027505).

Almost surely, 2^321978628 is an apocalyptic number.

It is an amenable number.

321978628 is a deficient number, since it is larger than the sum of its proper divisors (242351432).

321978628 is a wasteful number, since it uses less digits than its factorization.

321978628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123926 (or 123924 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 321978628 is about 17943.7629275467. The cubic root of 321978628 is about 685.3972356306.

The spelling of 321978628 in words is "three hundred twenty-one million, nine hundred seventy-eight thousand, six hundred twenty-eight".