90180440 has 32 divisors (see below), whose sum is σ = 231893280. Its totient is φ = 30918912.

The previous prime is 90180439. The next prime is 90180449. The reversal of 90180440 is 4408109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90180449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160757 + ... + 161316.

It is an arithmetic number, because the mean of its divisors is an integer number (7246665).

Almost surely, 2^90180440 is an apocalyptic number.

It is an amenable number.

90180440 is an abundant number, since it is smaller than the sum of its proper divisors (141712840).

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

90180440 is a wasteful number, since it uses less digits than its factorization.

90180440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322091 (or 322087 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 90180440 is about 9496.3382416593. The cubic root of 90180440 is about 448.4397653493.

Adding to 90180440 its reverse (4408109), we get a palindrome (94588549).

The spelling of 90180440 in words is "ninety million, one hundred eighty thousand, four hundred forty".