79870107769 has 27 divisors (see below), whose sum is σ = 83972798247. Its totient is φ = 75966374400.

The previous prime is 79870107767. The next prime is 79870107791. The reversal of 79870107769 is 96770107897.

The square root of 79870107769 is 282613.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 20815275625 + 59054832144 = 144275^2 + 243012^2 .

It is not a de Polignac number, because 79870107769 - 2¹ = 79870107767 is a prime.

It is a super-2 number, since 2×79870107769² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79870107767) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 706815057 + ... + 706815169.

Almost surely, 2^79870107769 is an apocalyptic number.

79870107769 is the 282613-rd square number.

79870107769 is the 141307-th centered octagonal number.

It is an amenable number.

79870107769 is a deficient number, since it is larger than the sum of its proper divisors (4102690478).

79870107769 is an frugal number, since it uses more digits than its factorization.

79870107769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 9335088, while the sum is 61.

The spelling of 79870107769 in words is "seventy-nine billion, eight hundred seventy million, one hundred seven thousand, seven hundred sixty-nine".