90609720 has 32 divisors (see below), whose sum is σ = 271829520. Its totient is φ = 24162560.

The previous prime is 90609709. The next prime is 90609751. The reversal of 90609720 is 2790609.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377421 + ... + 377660.

Almost surely, 2^90609720 is an apocalyptic number.

It is an amenable number.

90609720 is an abundant number, since it is smaller than the sum of its proper divisors (181219800).

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

90609720 is a wasteful number, since it uses less digits than its factorization.

90609720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755095 (or 755091 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 90609720 is about 9518.9138035807. The cubic root of 90609720 is about 449.1501986742.

The spelling of 90609720 in words is "ninety million, six hundred nine thousand, seven hundred twenty".