90621870 has 32 divisors (see below), whose sum is σ = 219162240. Its totient is φ = 23980320.

The previous prime is 90621857. The next prime is 90621871. The reversal of 90621870 is 7812609.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90621871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7600 + ... + 15459.

It is an arithmetic number, because the mean of its divisors is an integer number (6848820).

Almost surely, 2^90621870 is an apocalyptic number.

90621870 is an abundant number, since it is smaller than the sum of its proper divisors (128540370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90621870 is a wasteful number, since it uses less digits than its factorization.

90621870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23200.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 90621870 is about 9519.5519852564. The cubic root of 90621870 is about 449.1702735294.

The spelling of 90621870 in words is "ninety million, six hundred twenty-one thousand, eight hundred seventy".