90261040 has 40 divisors (see below), whose sum is σ = 211392720. Its totient is φ = 35840256.

The previous prime is 90261013. The next prime is 90261053. The reversal of 90261040 is 4016209.

90261040 = T₁₂₁ + T₁₂₂ + ... + T₈₁₅.

It is a tau number, because it is divible by the number of its divisors (40).

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, 7062 + ... + 15178.

It is an arithmetic number, because the mean of its divisors is an integer number (5284818).

Almost surely, 2^90261040 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 90261040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105696360).

90261040 is an abundant number, since it is smaller than the sum of its proper divisors (121131680).

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

90261040 is a wasteful number, since it uses less digits than its factorization.

90261040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8269 (or 8263 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 90261040 is about 9500.5810348631. The cubic root of 90261040 is about 448.5733252887.

Adding to 90261040 its reverse (4016209), we get a palindrome (94277249).

The spelling of 90261040 in words is "ninety million, two hundred sixty-one thousand, forty".