84520090 has 16 divisors (see below), whose sum is σ = 161085672. Its totient is φ = 31819264.

The previous prime is 84520067. The next prime is 84520091. The reversal of 84520090 is 9002548.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 84437721 + 82369 = 9189^2 + 287^2 .

It is a super-2 number, since 2×84520090² = 14287291227216200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84520091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248419 + ... + 248758.

Almost surely, 2^84520090 is an apocalyptic number.

84520090 is a deficient number, since it is larger than the sum of its proper divisors (76565582).

84520090 is a wasteful number, since it uses less digits than its factorization.

84520090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497201.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 84520090 is about 9193.4808424231. The cubic root of 84520090 is about 438.8539216446.

The spelling of 84520090 in words is "eighty-four million, five hundred twenty thousand, ninety".