77669999 has 4 divisors (see below), whose sum is σ = 84730920. Its totient is φ = 70609080.

The previous prime is 77669983. The next prime is 77670001. The reversal of 77669999 is 99996677.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77669999 - 2⁴ = 77669983 is a prime.

It is a Duffinian number.

77669999 is a modest number, since divided by 9999 gives 7766 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77669099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3530444 + ... + 3530465.

It is an arithmetic number, because the mean of its divisors is an integer number (21182730).

Almost surely, 2^77669999 is an apocalyptic number.

77669999 is a deficient number, since it is larger than the sum of its proper divisors (7060921).

77669999 is a wasteful number, since it uses less digits than its factorization.

77669999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060920.

The product of its digits is 11573604, while the sum is 62.

The square root of 77669999 is about 8813.0584362070. The cubic root of 77669999 is about 426.6624601500.

It can be divided in two parts, 77 and 669999, that added together give a palindrome (670076).

The spelling of 77669999 in words is "seventy-seven million, six hundred sixty-nine thousand, nine hundred ninety-nine".