79864173 has 24 divisors (see below), whose sum is σ = 120159000. Its totient is φ = 51053184.

The previous prime is 79864171. The next prime is 79864199. The reversal of 79864173 is 37146897.

It can be written as a sum of positive squares in 4 ways, for example, as 15896169 + 63968004 = 3987^2 + 7998^2 .

It is not a de Polignac number, because 79864173 - 2¹ = 79864171 is a prime.

It is a super-2 number, since 2×79864173² = 12756572257947858, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79864171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40003 + ... + 41951.

It is an arithmetic number, because the mean of its divisors is an integer number (5006625).

Almost surely, 2^79864173 is an apocalyptic number.

It is an amenable number.

79864173 is a deficient number, since it is larger than the sum of its proper divisors (40294827).

79864173 is a wasteful number, since it uses less digits than its factorization.

79864173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141 (or 2138 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 79864173 is about 8936.6757242277. The cubic root of 79864173 is about 430.6429411981.

The spelling of 79864173 in words is "seventy-nine million, eight hundred sixty-four thousand, one hundred seventy-three".