79478779 has 4 divisors (see below), whose sum is σ = 79765984. Its totient is φ = 79191576.

The previous prime is 79478771. The next prime is 79478783. The reversal of 79478779 is 97787497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97787497 = 109 ⋅897133.

It is a cyclic number.

It is not a de Polignac number, because 79478779 - 2³ = 79478771 is a prime.

It is a super-2 number, since 2×79478779² = 12633752622661682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79478771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143187 + ... + 143740.

It is an arithmetic number, because the mean of its divisors is an integer number (19941496).

Almost surely, 2^79478779 is an apocalyptic number.

79478779 is a deficient number, since it is larger than the sum of its proper divisors (287205).

79478779 is a wasteful number, since it uses less digits than its factorization.

79478779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287204.

The product of its digits is 6223392, while the sum is 58.

The square root of 79478779 is about 8915.0871560518. The cubic root of 79478779 is about 429.9491178300.

The spelling of 79478779 in words is "seventy-nine million, four hundred seventy-eight thousand, seven hundred seventy-nine".