90513540 has 144 divisors (see below), whose sum is σ = 302335488. Its totient is φ = 21779712.

The previous prime is 90513517. The next prime is 90513541. The reversal of 90513540 is 4531509.

It is not an unprimeable number, because it can be changed into a prime (90513541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109569 + ... + 110391.

It is an arithmetic number, because the mean of its divisors is an integer number (2099552).

Almost surely, 2^90513540 is an apocalyptic number.

90513540 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90513540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151167744).

90513540 is an abundant number, since it is smaller than the sum of its proper divisors (211821948).

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

90513540 is a wasteful number, since it uses less digits than its factorization.

90513540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 90513540 is about 9513.8604152048. The cubic root of 90513540 is about 448.9912217635.

The spelling of 90513540 in words is "ninety million, five hundred thirteen thousand, five hundred forty".