84891790 has 16 divisors (see below), whose sum is σ = 153028512. Its totient is φ = 33907104.

The previous prime is 84891731. The next prime is 84891797. The reversal of 84891790 is 9719848.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 84891790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84891797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432 + ... + 13108.

It is an arithmetic number, because the mean of its divisors is an integer number (9564282).

Almost surely, 2^84891790 is an apocalyptic number.

84891790 is a deficient number, since it is larger than the sum of its proper divisors (68136722).

84891790 is a wasteful number, since it uses less digits than its factorization.

84891790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12411.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 84891790 is about 9213.6740771529. The cubic root of 84891790 is about 439.4963072234.

The spelling of 84891790 in words is "eighty-four million, eight hundred ninety-one thousand, seven hundred ninety".