77679617 has 4 divisors (see below), whose sum is σ = 78615600. Its totient is φ = 76743636.

The previous prime is 77679601. The next prime is 77679631. The reversal of 77679617 is 71697677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71697677 = 1709 ⋅41953.

It is a cyclic number.

It is not a de Polignac number, because 77679617 - 2⁴ = 77679601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77679517) 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, 467867 + ... + 468032.

It is an arithmetic number, because the mean of its divisors is an integer number (19653900).

Almost surely, 2^77679617 is an apocalyptic number.

It is an amenable number.

77679617 is a deficient number, since it is larger than the sum of its proper divisors (935983).

77679617 is an equidigital number, since it uses as much as digits as its factorization.

77679617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935982.

The product of its digits is 777924, while the sum is 50.

The square root of 77679617 is about 8813.6040868648. The cubic root of 77679617 is about 426.6800708544.

The spelling of 77679617 in words is "seventy-seven million, six hundred seventy-nine thousand, six hundred seventeen".