77670691 has 4 divisors (see below), whose sum is σ = 88766512. Its totient is φ = 66574872.

The previous prime is 77670647. The next prime is 77670709. The reversal of 77670691 is 19607677.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-77670691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77670191) 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, 5547900 + ... + 5547913.

It is an arithmetic number, because the mean of its divisors is an integer number (22191628).

Almost surely, 2^77670691 is an apocalyptic number.

77670691 is a deficient number, since it is larger than the sum of its proper divisors (11095821).

77670691 is a wasteful number, since it uses less digits than its factorization.

77670691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11095820.

The product of its (nonzero) digits is 111132, while the sum is 43.

The square root of 77670691 is about 8813.0976960431. The cubic root of 77670691 is about 426.6637272611.

The spelling of 77670691 in words is "seventy-seven million, six hundred seventy thousand, six hundred ninety-one".