84999915 has 256 divisors, whose sum is σ = 220631040. Its totient is φ = 29859840.

The previous prime is 84999913. The next prime is 84999931. The reversal of 84999915 is 51999948.

It is not a de Polignac number, because 84999915 - 2¹ = 84999913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84999913) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2297277 + ... + 2297313.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^84999915 is an apocalyptic number.

84999915 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

84999915 is an abundant number, since it is smaller than the sum of its proper divisors (135631125).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84999915 is a wasteful number, since it uses less digits than its factorization.

84999915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 93 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 84999915 is about 9219.5398475195. The cubic root of 84999915 is about 439.6828206548.

It can be divided in two parts, 84 and 999915, that added together give a palindrome (999999).

The spelling of 84999915 in words is "eighty-four million, nine hundred ninety-nine thousand, nine hundred fifteen".