90721822 has 24 divisors (see below), whose sum is σ = 140988456. Its totient is φ = 43774224.

The previous prime is 90721801. The next prime is 90721837. The reversal of 90721822 is 22812709.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 577768 + ... + 577924.

It is an arithmetic number, because the mean of its divisors is an integer number (5874519).

Almost surely, 2^90721822 is an apocalyptic number.

90721822 is a deficient number, since it is larger than the sum of its proper divisors (50266634).

90721822 is a wasteful number, since it uses less digits than its factorization.

90721822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 90721822 is about 9524.8003653620. The cubic root of 90721822 is about 449.3353513094.

The spelling of 90721822 in words is "ninety million, seven hundred twenty-one thousand, eight hundred twenty-two".