79728361 has 4 divisors (see below), whose sum is σ = 79794052. Its totient is φ = 79662672.

The previous prime is 79728359. The next prime is 79728367. The reversal of 79728361 is 16382797.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 58614336 = 4595^2 + 7656^2 .

It is a cyclic number.

It is not a de Polignac number, because 79728361 - 2¹ = 79728359 is a prime.

It is a super-2 number, since 2×79728361² = 12713223095492642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79728367) 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, 30990 + ... + 33463.

It is an arithmetic number, because the mean of its divisors is an integer number (19948513).

Almost surely, 2^79728361 is an apocalyptic number.

It is an amenable number.

79728361 is a deficient number, since it is larger than the sum of its proper divisors (65691).

79728361 is a wasteful number, since it uses less digits than its factorization.

79728361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65690.

The product of its digits is 127008, while the sum is 43.

The square root of 79728361 is about 8929.0739161461. The cubic root of 79728361 is about 430.3986945766.

It can be divided in two parts, 79728 and 361, that added together give a square (80089 = 283²).

The spelling of 79728361 in words is "seventy-nine million, seven hundred twenty-eight thousand, three hundred sixty-one".