90831785 has 16 divisors (see below), whose sum is σ = 119705472. Its totient is φ = 65616000.

The previous prime is 90831757. The next prime is 90831859. The reversal of 90831785 is 58713809.

It is a happy number.

It is not a de Polignac number, because 90831785 - 2⁶ = 90831721 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 2837 + ... + 13773.

It is an arithmetic number, because the mean of its divisors is an integer number (7481592).

Almost surely, 2^90831785 is an apocalyptic number.

It is an amenable number.

90831785 is a deficient number, since it is larger than the sum of its proper divisors (28873687).

90831785 is a wasteful number, since it uses less digits than its factorization.

90831785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11104.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 90831785 is about 9530.5710741802. The cubic root of 90831785 is about 449.5168229493.

The spelling of 90831785 in words is "ninety million, eight hundred thirty-one thousand, seven hundred eighty-five".