321666402 has 64 divisors (see below), whose sum is σ = 689762304. Its totient is φ = 99845760.

The previous prime is 321666383. The next prime is 321666437. The reversal of 321666402 is 204666123.

It is a self number, because there is not a number n which added to its sum of digits gives 321666402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 496843 + ... + 497489.

It is an arithmetic number, because the mean of its divisors is an integer number (10777536).

Almost surely, 2^321666402 is an apocalyptic number.

321666402 is an abundant number, since it is smaller than the sum of its proper divisors (368095902).

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

321666402 is a wasteful number, since it uses less digits than its factorization.

321666402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 321666402 is about 17935.0606912829. The cubic root of 321666402 is about 685.1756183882.

The spelling of 321666402 in words is "three hundred twenty-one million, six hundred sixty-six thousand, four hundred two".