79919645 has 16 divisors (see below), whose sum is σ = 103866672. Its totient is φ = 58682880.

The previous prime is 79919633. The next prime is 79919647. The reversal of 79919645 is 54691997.

It can be written as a sum of positive squares in 8 ways, for example, as 43943641 + 35976004 = 6629^2 + 5998^2 .

It is a de Polignac number, because none of the positive numbers 2^k-79919645 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79919593 and 79919602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79919647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8369 + ... + 15161.

It is an arithmetic number, because the mean of its divisors is an integer number (6491667).

Almost surely, 2^79919645 is an apocalyptic number.

It is an amenable number.

79919645 is a deficient number, since it is larger than the sum of its proper divisors (23947027).

79919645 is a wasteful number, since it uses less digits than its factorization.

79919645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6992.

The product of its digits is 612360, while the sum is 50.

The square root of 79919645 is about 8939.7788003955. The cubic root of 79919645 is about 430.7426233443.

The spelling of 79919645 in words is "seventy-nine million, nine hundred nineteen thousand, six hundred forty-five".