77790069 has 24 divisors (see below), whose sum is σ = 129292800. Its totient is φ = 44147808.

The previous prime is 77790017. The next prime is 77790091. The reversal of 77790069 is 96009777.

It is not a de Polignac number, because 77790069 - 2⁸ = 77789813 is a prime.

It is a super-2 number, since 2×77790069² = 12102589670049522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77791069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5244 + ... + 13530.

It is an arithmetic number, because the mean of its divisors is an integer number (5387200).

Almost surely, 2^77790069 is an apocalyptic number.

It is an amenable number.

77790069 is a deficient number, since it is larger than the sum of its proper divisors (51502731).

77790069 is a wasteful number, since it uses less digits than its factorization.

77790069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8449 (or 8446 counting only the distinct ones).

The product of its (nonzero) digits is 166698, while the sum is 45.

The square root of 77790069 is about 8819.8678561529. The cubic root of 77790069 is about 426.8822060254.

The spelling of 77790069 in words is "seventy-seven million, seven hundred ninety thousand, sixty-nine".