78844679 has 2 divisors, whose sum is σ = 78844680. Its totient is φ = 78844678.

The previous prime is 78844663. The next prime is 78844721. The reversal of 78844679 is 97644887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78844679 - 2⁴ = 78844663 is a prime.

It is a super-2 number, since 2×78844679² = 12432966813226082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78844679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78844639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39422339 + 39422340.

It is an arithmetic number, because the mean of its divisors is an integer number (39422340).

Almost surely, 2^78844679 is an apocalyptic number.

78844679 is a deficient number, since it is larger than the sum of its proper divisors (1).

78844679 is an equidigital number, since it uses as much as digits as its factorization.

78844679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 53.

The square root of 78844679 is about 8879.4526295262. The cubic root of 78844679 is about 428.8026524599.

The spelling of 78844679 in words is "seventy-eight million, eight hundred forty-four thousand, six hundred seventy-nine".