79817157 has 80 divisors (see below), whose sum is σ = 148684800. Its totient is φ = 41640480.

The previous prime is 79817131. The next prime is 79817161. The reversal of 79817157 is 75171897.

It is a happy number.

It is not a de Polignac number, because 79817157 - 2¹⁰ = 79816133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79817557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 333844 + ... + 334082.

It is an arithmetic number, because the mean of its divisors is an integer number (1858560).

Almost surely, 2^79817157 is an apocalyptic number.

It is an amenable number.

79817157 is a deficient number, since it is larger than the sum of its proper divisors (68867643).

79817157 is a wasteful number, since it uses less digits than its factorization.

79817157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 299 counting only the distinct ones).

The product of its digits is 123480, while the sum is 45.

The square root of 79817157 is about 8934.0448286317. The cubic root of 79817157 is about 430.5584181793.

It can be divided in two parts, 798 and 17157, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 79817157 in words is "seventy-nine million, eight hundred seventeen thousand, one hundred fifty-seven".