84640290 has 32 divisors (see below), whose sum is σ = 232156800. Its totient is φ = 19346304.

The previous prime is 84640289. The next prime is 84640321. The reversal of 84640290 is 9204648.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201315 + ... + 201734.

It is an arithmetic number, because the mean of its divisors is an integer number (7254900).

Almost surely, 2^84640290 is an apocalyptic number.

84640290 is an abundant number, since it is smaller than the sum of its proper divisors (147516510).

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

84640290 is a wasteful number, since it uses less digits than its factorization.

84640290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403066.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 84640290 is about 9200.0157608561. The cubic root of 84640290 is about 439.0618613779.

The spelling of 84640290 in words is "eighty-four million, six hundred forty thousand, two hundred ninety".