321696816 has 40 divisors (see below), whose sum is σ = 949772544. Its totient is φ = 91913280.

The previous prime is 321696799. The next prime is 321696821. The reversal of 321696816 is 618696123.

It is a super-3 number, since 3×321696816³ (a number of 26 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478380 + ... + 479051.

Almost surely, 2^321696816 is an apocalyptic number.

It is an amenable number.

321696816 is an abundant number, since it is smaller than the sum of its proper divisors (628075728).

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

321696816 is a wasteful number, since it uses less digits than its factorization.

321696816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957449 (or 957443 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 321696816 is about 17935.9085635493. The cubic root of 321696816 is about 685.1972124728.

The spelling of 321696816 in words is "three hundred twenty-one million, six hundred ninety-six thousand, eight hundred sixteen".