78317672 has 16 divisors (see below), whose sum is σ = 147039300. Its totient is φ = 39107200.

The previous prime is 78317647. The next prime is 78317689. The reversal of 78317672 is 27671387.

It can be written as a sum of positive squares in 2 ways, for example, as 53377636 + 24940036 = 7306^2 + 4994^2 .

It is a super-2 number, since 2×78317672² = 12267315494999168, which contains 22 as substring.

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, 422 + ... + 12522.

Almost surely, 2^78317672 is an apocalyptic number.

It is an amenable number.

78317672 is a deficient number, since it is larger than the sum of its proper divisors (68721628).

78317672 is a wasteful number, since it uses less digits than its factorization.

78317672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12916 (or 12912 counting only the distinct ones).

The product of its digits is 98784, while the sum is 41.

The square root of 78317672 is about 8849.7272274348. The cubic root of 78317672 is about 427.8451269509.

The spelling of 78317672 in words is "seventy-eight million, three hundred seventeen thousand, six hundred seventy-two".