79869969 has 21 divisors (see below), whose sum is σ = 120113049. Its totient is φ = 53085780.

The previous prime is 79869943. The next prime is 79869971. The reversal of 79869969 is 96996897.

The square root of 79869969 is 8937.

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

It is not a de Polignac number, because 79869969 - 2¹⁵ = 79837201 is a prime.

It is a super-2 number, since 2×79869969² = 12758423896121922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79869989) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 241134 + ... + 241464.

It is an arithmetic number, because the mean of its divisors is an integer number (5719669).

Almost surely, 2^79869969 is an apocalyptic number.

79869969 is the 8937-th square number.

79869969 is the 4469-th centered octagonal number.

It is an amenable number.

79869969 is a deficient number, since it is larger than the sum of its proper divisors (40243080).

79869969 is an frugal number, since it uses more digits than its factorization.

79869969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 334 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 63.

The cubic root of 79869969 is about 430.6533586607.

It can be divided in two parts, 7986 and 9969, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 79869969 in words is "seventy-nine million, eight hundred sixty-nine thousand, nine hundred sixty-nine".