90500440 has 32 divisors (see below), whose sum is σ = 204120000. Its totient is φ = 36112384.

The previous prime is 90500429. The next prime is 90500453. The reversal of 90500440 is 4400509.

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, 15441 + ... + 20479.

It is an arithmetic number, because the mean of its divisors is an integer number (6378750).

Almost surely, 2^90500440 is an apocalyptic number.

It is an amenable number.

90500440 is an abundant number, since it is smaller than the sum of its proper divisors (113619560).

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

90500440 is a wasteful number, since it uses less digits than its factorization.

90500440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499 (or 5495 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 90500440 is about 9513.1719210787. The cubic root of 90500440 is about 448.9695599260.

Adding to 90500440 its reverse (4400509), we get a palindrome (94900949).

The spelling of 90500440 in words is "ninety million, five hundred thousand, four hundred forty".