78516997 has 16 divisors (see below), whose sum is σ = 87333120. Its totient is φ = 70120512.

The previous prime is 78516979. The next prime is 78517013. The reversal of 78516997 is 79961587.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78516997 - 2⁷ = 78516869 is a prime.

It is a Duffinian number.

Its product of digits (952560) is a multiple of the sum of its prime divisors (972).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78516947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114618 + ... + 115300.

It is an arithmetic number, because the mean of its divisors is an integer number (5458320).

Almost surely, 2^78516997 is an apocalyptic number.

It is an amenable number.

78516997 is a deficient number, since it is larger than the sum of its proper divisors (8816123).

78516997 is a wasteful number, since it uses less digits than its factorization.

78516997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972.

The product of its digits is 952560, while the sum is 52.

The square root of 78516997 is about 8860.9817176202. The cubic root of 78516997 is about 428.2077866225.

The spelling of 78516997 in words is "seventy-eight million, five hundred sixteen thousand, nine hundred ninety-seven".