79899897 has 16 divisors (see below), whose sum is σ = 132820992. Its totient is φ = 41506320.

The previous prime is 79899863. The next prime is 79899929.

79899897 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 79899897 - 2¹¹ = 79897849 is a prime.

It is a super-2 number, since 2×79899897² = 12767987081221218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79899797) 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, 172713 + ... + 173174.

It is an arithmetic number, because the mean of its divisors is an integer number (8301312).

Almost surely, 2^79899897 is an apocalyptic number.

79899897 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

79899897 is a deficient number, since it is larger than the sum of its proper divisors (52921095).

79899897 is a wasteful number, since it uses less digits than its factorization.

79899897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345908.

The product of its digits is 20575296, while the sum is 66.

The square root of 79899897 is about 8938.6742305557. The cubic root of 79899897 is about 430.7071418468.

The spelling of 79899897 in words is "seventy-nine million, eight hundred ninety-nine thousand, eight hundred ninety-seven".