78966719 has 4 divisors (see below), whose sum is σ = 85041096. Its totient is φ = 72892344.

The previous prime is 78966709. The next prime is 78966733. The reversal of 78966719 is 91766987.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78966719 - 2⁸ = 78966463 is a prime.

It is a super-2 number, since 2×78966719² = 12471485419249922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78966709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3037169 + ... + 3037194.

It is an arithmetic number, because the mean of its divisors is an integer number (21260274).

Almost surely, 2^78966719 is an apocalyptic number.

78966719 is a deficient number, since it is larger than the sum of its proper divisors (6074377).

78966719 is a wasteful number, since it uses less digits than its factorization.

78966719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074376.

The product of its digits is 1143072, while the sum is 53.

The square root of 78966719 is about 8886.3220175728. The cubic root of 78966719 is about 429.0237796147.

The spelling of 78966719 in words is "seventy-eight million, nine hundred sixty-six thousand, seven hundred nineteen".