84779899 has 4 divisors (see below), whose sum is σ = 84822136. Its totient is φ = 84737664.

The previous prime is 84779897. The next prime is 84779927. The reversal of 84779899 is 99897748.

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 84779899 - 2¹ = 84779897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84779897) 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, 17949 + ... + 22174.

It is an arithmetic number, because the mean of its divisors is an integer number (21205534).

Almost surely, 2^84779899 is an apocalyptic number.

84779899 is a deficient number, since it is larger than the sum of its proper divisors (42237).

84779899 is a wasteful number, since it uses less digits than its factorization.

84779899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42236.

The product of its digits is 9144576, while the sum is 61.

The square root of 84779899 is about 9207.6000673357. The cubic root of 84779899 is about 439.3031307008.

The spelling of 84779899 in words is "eighty-four million, seven hundred seventy-nine thousand, eight hundred ninety-nine".