90123642 has 36 divisors (see below), whose sum is σ = 227150586. Its totient is φ = 25749360.

The previous prime is 90123629. The next prime is 90123653. The reversal of 90123642 is 24632109.

90123642 is a `hidden beast` number, since 9 + 0 + 12 + 3 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 89699841 + 423801 = 9471^2 + 651^2 .

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 17 ways as a sum of consecutive naturals, for example, 50209 + ... + 51972.

Almost surely, 2^90123642 is an apocalyptic number.

90123642 is an abundant number, since it is smaller than the sum of its proper divisors (137026944).

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

90123642 is a wasteful number, since it uses less digits than its factorization.

90123642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102203 (or 102193 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 90123642 is about 9493.3472495216. The cubic root of 90123642 is about 448.3455992124.

The spelling of 90123642 in words is "ninety million, one hundred twenty-three thousand, six hundred forty-two".