90609642 has 12 divisors (see below), whose sum is σ = 196320930. Its totient is φ = 30203208.

The previous prime is 90609641. The next prime is 90609647. The reversal of 90609642 is 24690609.

90609642 is a `hidden beast` number, since 9 + 0 + 6 + 0 + 9 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60699681 + 29909961 = 7791^2 + 5469^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90609597 and 90609606.

It is not an unprimeable number, because it can be changed into a prime (90609641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2516917 + ... + 2516952.

Almost surely, 2^90609642 is an apocalyptic number.

90609642 is an abundant number, since it is smaller than the sum of its proper divisors (105711288).

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

90609642 is a wasteful number, since it uses less digits than its factorization.

90609642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5033877 (or 5033874 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 90609642 is about 9518.9097064737. The cubic root of 90609642 is about 449.1500697928.

The spelling of 90609642 in words is "ninety million, six hundred nine thousand, six hundred forty-two".