90527640 has 128 divisors (see below), whose sum is σ = 317122560. Its totient is φ = 20242944.

The previous prime is 90527623. The next prime is 90527663. The reversal of 90527640 is 4672509.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38334 + ... + 40626.

It is an arithmetic number, because the mean of its divisors is an integer number (2477520).

Almost surely, 2^90527640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90527640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158561280).

90527640 is an abundant number, since it is smaller than the sum of its proper divisors (226594920).

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

90527640 is a wasteful number, since it uses less digits than its factorization.

90527640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361 (or 2357 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 90527640 is about 9514.6014104638. The cubic root of 90527640 is about 449.0145348410.

The spelling of 90527640 in words is "ninety million, five hundred twenty-seven thousand, six hundred forty".