90621688 has 16 divisors (see below), whose sum is σ = 170019360. Its totient is φ = 45283200.

The previous prime is 90621637. The next prime is 90621691. The reversal of 90621688 is 88612609.

It is a self number, because there is not a number n which added to its sum of digits gives 90621688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19248 + ... + 23488.

It is an arithmetic number, because the mean of its divisors is an integer number (10626210).

Almost surely, 2^90621688 is an apocalyptic number.

It is an amenable number.

90621688 is a deficient number, since it is larger than the sum of its proper divisors (79397672).

90621688 is a wasteful number, since it uses less digits than its factorization.

90621688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6918 (or 6914 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 90621688 is about 9519.5424259783. The cubic root of 90621688 is about 449.1699728329.

It can be divided in two parts, 906216 and 88, that added together give a square (906304 = 952²).

The spelling of 90621688 in words is "ninety million, six hundred twenty-one thousand, six hundred eighty-eight".