78417979 has 8 divisors (see below), whose sum is σ = 79376000. Its totient is φ = 77464512.

The previous prime is 78417947. The next prime is 78418027. The reversal of 78417979 is 97971487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78417979 - 2⁵ = 78417947 is a prime.

It is a super-2 number, since 2×78417979² = 12298758860888882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78417919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43702 + ... + 45460.

It is an arithmetic number, because the mean of its divisors is an integer number (9922000).

Almost surely, 2^78417979 is an apocalyptic number.

78417979 is a deficient number, since it is larger than the sum of its proper divisors (958021).

78417979 is a wasteful number, since it uses less digits than its factorization.

78417979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277.

The product of its digits is 889056, while the sum is 52.

The square root of 78417979 is about 8855.3926508089. The cubic root of 78417979 is about 428.0277062304.

The spelling of 78417979 in words is "seventy-eight million, four hundred seventeen thousand, nine hundred seventy-nine".