78320972 has 12 divisors (see below), whose sum is σ = 145124280. Its totient is φ = 36856896.

The previous prime is 78320959. The next prime is 78320981. The reversal of 78320972 is 27902387.

It is a super-2 number, since 2×78320972² = 12268349310049568, 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, 575822 + ... + 575957.

It is an arithmetic number, because the mean of its divisors is an integer number (12093690).

Almost surely, 2^78320972 is an apocalyptic number.

It is an amenable number.

78320972 is a deficient number, since it is larger than the sum of its proper divisors (66803308).

78320972 is a wasteful number, since it uses less digits than its factorization.

78320972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151800 (or 1151798 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 78320972 is about 8849.9136718953. The cubic root of 78320972 is about 427.8511361059.

The spelling of 78320972 in words is "seventy-eight million, three hundred twenty thousand, nine hundred seventy-two".