77979899 has 8 divisors (see below), whose sum is σ = 79546992. Its totient is φ = 76422240.

The previous prime is 77979883. The next prime is 77979917. The reversal of 77979899 is 99897977.

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 77979899 - 2⁴ = 77979883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77979599) 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, 15692 + ... + 20054.

It is an arithmetic number, because the mean of its divisors is an integer number (9943374).

Almost surely, 2^77979899 is an apocalyptic number.

77979899 is a deficient number, since it is larger than the sum of its proper divisors (1567093).

77979899 is a wasteful number, since it uses less digits than its factorization.

77979899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4717.

The product of its digits is 18003384, while the sum is 65.

The square root of 77979899 is about 8830.6227979684. The cubic root of 77979899 is about 427.2291621481.

The spelling of 77979899 in words is "seventy-seven million, nine hundred seventy-nine thousand, eight hundred ninety-nine".