90681790 has 16 divisors (see below), whose sum is σ = 164231568. Its totient is φ = 36049536.

The previous prime is 90681779. The next prime is 90681803. The reversal of 90681790 is 9718609.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26187 + ... + 29446.

It is an arithmetic number, because the mean of its divisors is an integer number (10264473).

Almost surely, 2^90681790 is an apocalyptic number.

90681790 is a deficient number, since it is larger than the sum of its proper divisors (73549778).

90681790 is a wasteful number, since it uses less digits than its factorization.

90681790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55803.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 90681790 is about 9522.6986721202. The cubic root of 90681790 is about 449.2692502002.

The spelling of 90681790 in words is "ninety million, six hundred eighty-one thousand, seven hundred ninety".