78717972 has 12 divisors (see below), whose sum is σ = 183675296. Its totient is φ = 26239320.

The previous prime is 78717943. The next prime is 78717979. The reversal of 78717972 is 27971787.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×78717972³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78717979) 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, 3279904 + ... + 3279927.

Almost surely, 2^78717972 is an apocalyptic number.

It is an amenable number.

78717972 is an abundant number, since it is smaller than the sum of its proper divisors (104957324).

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

78717972 is a wasteful number, since it uses less digits than its factorization.

78717972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6559838 (or 6559836 counting only the distinct ones).

The product of its digits is 345744, while the sum is 48.

The square root of 78717972 is about 8872.3149177653. The cubic root of 78717972 is about 428.5728274875.

The spelling of 78717972 in words is "seventy-eight million, seven hundred seventeen thousand, nine hundred seventy-two".