84591090 has 24 divisors (see below), whose sum is σ = 219937068. Its totient is φ = 22557600.

The previous prime is 84591083. The next prime is 84591107. The reversal of 84591090 is 9019548.

It can be written as a sum of positive squares in 2 ways, for example, as 80514729 + 4076361 = 8973^2 + 2019^2 .

It is a super-3 number, since 3×84591090³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 469861 + ... + 470040.

Almost surely, 2^84591090 is an apocalyptic number.

84591090 is an abundant number, since it is smaller than the sum of its proper divisors (135345978).

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

84591090 is a wasteful number, since it uses less digits than its factorization.

84591090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939914 (or 939911 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 84591090 is about 9197.3414637057. The cubic root of 84591090 is about 438.9767717571.

The spelling of 84591090 in words is "eighty-four million, five hundred ninety-one thousand, ninety".