78347664 has 60 divisors (see below), whose sum is σ = 226350592. Its totient is φ = 25272000.

The previous prime is 78347657. The next prime is 78347681. The reversal of 78347664 is 46674387.

It is a super-2 number, since 2×78347664² = 12276712908513792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4312 + ... + 13239.

Almost surely, 2^78347664 is an apocalyptic number.

It is an amenable number.

78347664 is an abundant number, since it is smaller than the sum of its proper divisors (148002928).

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

78347664 is a wasteful number, since it uses less digits than its factorization.

78347664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17596 (or 17587 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 78347664 is about 8851.4215807406. The cubic root of 78347664 is about 427.8997348619.

The spelling of 78347664 in words is "seventy-eight million, three hundred forty-seven thousand, six hundred sixty-four".