81833990 has 32 divisors (see below), whose sum is σ = 168791040. Its totient is φ = 27982944.

The previous prime is 81833989. The next prime is 81834037. The reversal of 81833990 is 9933818.

It is a congruent number.

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, 29399 + ... + 32061.

It is an arithmetic number, because the mean of its divisors is an integer number (5274720).

Almost surely, 2^81833990 is an apocalyptic number.

81833990 is an abundant number, since it is smaller than the sum of its proper divisors (86957050).

81833990 is a wasteful number, since it uses less digits than its factorization.

81833990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 81833990 is about 9046.2141252570. The cubic root of 81833990 is about 434.1547686456.

The spelling of 81833990 in words is "eighty-one million, eight hundred thirty-three thousand, nine hundred ninety".