78914561 has 16 divisors (see below), whose sum is σ = 94099968. Its totient is φ = 65337600.

The previous prime is 78914557. The next prime is 78914573. The reversal of 78914561 is 16541987.

It is a cyclic number.

It is not a de Polignac number, because 78914561 - 2² = 78914557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78914501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1010 + ... + 12603.

It is an arithmetic number, because the mean of its divisors is an integer number (5881248).

Almost surely, 2^78914561 is an apocalyptic number.

It is an amenable number.

78914561 is a deficient number, since it is larger than the sum of its proper divisors (15185407).

78914561 is a wasteful number, since it uses less digits than its factorization.

78914561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13672.

The product of its digits is 60480, while the sum is 41.

The square root of 78914561 is about 8883.3867978379. The cubic root of 78914561 is about 428.9293012019.

The spelling of 78914561 in words is "seventy-eight million, nine hundred fourteen thousand, five hundred sixty-one".