79478117 has 4 divisors (see below), whose sum is σ = 79650240. Its totient is φ = 79305996.

The previous prime is 79478101. The next prime is 79478123. The reversal of 79478117 is 71187497.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71187497 = 4523 ⋅15739.

It is a cyclic number.

It is not a de Polignac number, because 79478117 - 2⁴ = 79478101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79478137) 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, 85367 + ... + 86292.

It is an arithmetic number, because the mean of its divisors is an integer number (19912560).

Almost surely, 2^79478117 is an apocalyptic number.

It is an amenable number.

79478117 is a deficient number, since it is larger than the sum of its proper divisors (172123).

79478117 is a wasteful number, since it uses less digits than its factorization.

79478117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172122.

The product of its digits is 98784, while the sum is 44.

The square root of 79478117 is about 8915.0500279023. The cubic root of 79478117 is about 429.9479241063.

The spelling of 79478117 in words is "seventy-nine million, four hundred seventy-eight thousand, one hundred seventeen".