84779 has 4 divisors (see below), whose sum is σ = 89784. Its totient is φ = 79776.

The previous prime is 84761. The next prime is 84787. The reversal of 84779 is 97748.

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

It is a cyclic number.

It is not a de Polignac number, because 84779 - 2⁸ = 84523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84719) 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, 2477 + ... + 2510.

It is an arithmetic number, because the mean of its divisors is an integer number (22446).

2⁸⁴⁷⁷⁹ is an apocalyptic number.

84779 is a deficient number, since it is larger than the sum of its proper divisors (5005).

84779 is a wasteful number, since it uses less digits than its factorization.

84779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004.

The product of its digits is 14112, while the sum is 35.

The square root of 84779 is about 291.1683361906. The cubic root of 84779 is about 43.9301577916.

The spelling of 84779 in words is "eighty-four thousand, seven hundred seventy-nine".