77680517 has 8 divisors (see below), whose sum is σ = 78251712. Its totient is φ = 77112000.

The previous prime is 77680487. The next prime is 77680543. The reversal of 77680517 is 71508677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77680517 - 2⁸ = 77680261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77686517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122792 + ... + 123422.

It is an arithmetic number, because the mean of its divisors is an integer number (9781464).

Almost surely, 2^77680517 is an apocalyptic number.

It is an amenable number.

77680517 is a deficient number, since it is larger than the sum of its proper divisors (571195).

77680517 is a wasteful number, since it uses less digits than its factorization.

77680517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 77680517 is about 8813.6551441499. The cubic root of 77680517 is about 426.6817186937.

The spelling of 77680517 in words is "seventy-seven million, six hundred eighty thousand, five hundred seventeen".