90305644 has 24 divisors (see below), whose sum is σ = 185664528. Its totient is φ = 37890240.

The previous prime is 90305629. The next prime is 90305647. The reversal of 90305644 is 44650309.

It is not an unprimeable number, because it can be changed into a prime (90305647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78367 + ... + 79510.

It is an arithmetic number, because the mean of its divisors is an integer number (7736022).

Almost surely, 2^90305644 is an apocalyptic number.

It is an amenable number.

90305644 is an abundant number, since it is smaller than the sum of its proper divisors (95358884).

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

90305644 is a wasteful number, since it uses less digits than its factorization.

90305644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157905 (or 157903 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 90305644 is about 9502.9281803032. The cubic root of 90305644 is about 448.6472031202.

The spelling of 90305644 in words is "ninety million, three hundred five thousand, six hundred forty-four".