79977 has 8 divisors (see below), whose sum is σ = 108864. Its totient is φ = 52208.

The previous prime is 79973. The next prime is 79979. The reversal of 79977 is 77997.

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 79977 - 2² = 79973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79973) 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, 93 + ... + 410.

It is an arithmetic number, because the mean of its divisors is an integer number (13608).

2⁷⁹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

79977 is a deficient number, since it is larger than the sum of its proper divisors (28887).

79977 is a wasteful number, since it uses less digits than its factorization.

79977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559.

The product of its digits is 27783, while the sum is 39.

The square root of 79977 is about 282.8020509119. The cubic root of 79977 is about 43.0845640717.

The spelling of 79977 in words is "seventy-nine thousand, nine hundred seventy-seven".