78322664 has 16 divisors (see below), whose sum is σ = 167834400. Its totient is φ = 33566832.

The previous prime is 78322663. The next prime is 78322687. The reversal of 78322664 is 46622387.

It is a super-2 number, since 2×78322664² = 12268879392113792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78322661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699254 + ... + 699365.

It is an arithmetic number, because the mean of its divisors is an integer number (10489650).

Almost surely, 2^78322664 is an apocalyptic number.

It is an amenable number.

78322664 is an abundant number, since it is smaller than the sum of its proper divisors (89511736).

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

78322664 is a wasteful number, since it uses less digits than its factorization.

78322664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398632 (or 1398628 counting only the distinct ones).

The product of its digits is 96768, while the sum is 38.

The square root of 78322664 is about 8850.0092655319. The cubic root of 78322664 is about 427.8542170981.

The spelling of 78322664 in words is "seventy-eight million, three hundred twenty-two thousand, six hundred sixty-four".