78698979 has 32 divisors (see below), whose sum is σ = 119808000. Its totient is φ = 51039072.

The previous prime is 78698947. The next prime is 78698989. The reversal of 78698979 is 97989687.

It is not a de Polignac number, because 78698979 - 2⁵ = 78698947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78698929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202117 + ... + 202505.

It is an arithmetic number, because the mean of its divisors is an integer number (3744000).

Almost surely, 2^78698979 is an apocalyptic number.

78698979 is a deficient number, since it is larger than the sum of its proper divisors (41109021).

78698979 is a wasteful number, since it uses less digits than its factorization.

78698979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 578 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 78698979 is about 8871.2445011960. The cubic root of 78698979 is about 428.5383561622.

The spelling of 78698979 in words is "seventy-eight million, six hundred ninety-eight thousand, nine hundred seventy-nine".