84991479 has 16 divisors (see below), whose sum is σ = 117150048. Its totient is φ = 54767232.

The previous prime is 84991471. The next prime is 84991493. The reversal of 84991479 is 97419948.

It is not a de Polignac number, because 84991479 - 2³ = 84991471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84991471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14989 + ... + 19865.

It is an arithmetic number, because the mean of its divisors is an integer number (7321878).

Almost surely, 2^84991479 is an apocalyptic number.

84991479 is a deficient number, since it is larger than the sum of its proper divisors (32158569).

84991479 is a wasteful number, since it uses less digits than its factorization.

84991479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5074.

The product of its digits is 653184, while the sum is 51.

The square root of 84991479 is about 9219.0823296031. The cubic root of 84991479 is about 439.6682744167.

The spelling of 84991479 in words is "eighty-four million, nine hundred ninety-one thousand, four hundred seventy-nine".