84086990 has 16 divisors (see below), whose sum is σ = 162999648. Its totient is φ = 31047456.

The previous prime is 84086987. The next prime is 84086999. The reversal of 84086990 is 9968048.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84086999) 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, 323282 + ... + 323541.

It is an arithmetic number, because the mean of its divisors is an integer number (10187478).

Almost surely, 2^84086990 is an apocalyptic number.

84086990 is a deficient number, since it is larger than the sum of its proper divisors (78912658).

84086990 is a wasteful number, since it uses less digits than its factorization.

84086990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646843.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 84086990 is about 9169.8958554610. The cubic root of 84086990 is about 438.1030421371.

The spelling of 84086990 in words is "eighty-four million, eighty-six thousand, nine hundred ninety".