90501640 has 16 divisors (see below), whose sum is σ = 203628780. Its totient is φ = 36200640.

The previous prime is 90501601. The next prime is 90501643. The reversal of 90501640 is 4610509.

It can be written as a sum of positive squares in 2 ways, for example, as 89529444 + 972196 = 9462^2 + 986^2 .

It is not an unprimeable number, because it can be changed into a prime (90501643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131231 + ... + 1131310.

Almost surely, 2^90501640 is an apocalyptic number.

It is an amenable number.

90501640 is an abundant number, since it is smaller than the sum of its proper divisors (113127140).

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

90501640 is a wasteful number, since it uses less digits than its factorization.

90501640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262552 (or 2262548 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 90501640 is about 9513.2349913160. The cubic root of 90501640 is about 448.9715443034.

The spelling of 90501640 in words is "ninety million, five hundred one thousand, six hundred forty".