77984969 has 4 divisors (see below), whose sum is σ = 78106896. Its totient is φ = 77863044.

The previous prime is 77984957. The next prime is 77984971. The reversal of 77984969 is 96948977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77984969 - 2⁴ = 77984953 is a prime.

It is a super-2 number, since 2×77984969² = 12163310779861922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77984989) 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, 59999 + ... + 61284.

It is an arithmetic number, because the mean of its divisors is an integer number (19526724).

Almost surely, 2^77984969 is an apocalyptic number.

It is an amenable number.

77984969 is a deficient number, since it is larger than the sum of its proper divisors (121927).

77984969 is a wasteful number, since it uses less digits than its factorization.

77984969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121926.

The product of its digits is 6858432, while the sum is 59.

The square root of 77984969 is about 8830.9098625227. The cubic root of 77984969 is about 427.2384209653.

The spelling of 77984969 in words is "seventy-seven million, nine hundred eighty-four thousand, nine hundred sixty-nine".