77660919 has 12 divisors (see below), whose sum is σ = 128202256. Its totient is φ = 44377632.

The previous prime is 77660909. The next prime is 77660941. The reversal of 77660919 is 91906677.

It is not a de Polignac number, because 77660919 - 2⁵ = 77660887 is a prime.

It is a super-2 number, since 2×77660919² = 12062436679849122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77660909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 616294 + ... + 616419.

Almost surely, 2^77660919 is an apocalyptic number.

77660919 is a deficient number, since it is larger than the sum of its proper divisors (50541337).

77660919 is a wasteful number, since it uses less digits than its factorization.

77660919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232726 (or 1232723 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 77660919 is about 8812.5432764895. The cubic root of 77660919 is about 426.6458331977.

The spelling of 77660919 in words is "seventy-seven million, six hundred sixty thousand, nine hundred nineteen".