90181320 has 64 divisors (see below), whose sum is σ = 276851520. Its totient is φ = 23487744.

The previous prime is 90181319. The next prime is 90181331. The reversal of 90181320 is 2318109.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3579 + ... + 13898.

It is an arithmetic number, because the mean of its divisors is an integer number (4325805).

Almost surely, 2^90181320 is an apocalyptic number.

It is an amenable number.

90181320 is an abundant number, since it is smaller than the sum of its proper divisors (186670200).

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

90181320 is a wasteful number, since it uses less digits than its factorization.

90181320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17534 (or 17530 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 90181320 is about 9496.3845751949. The cubic root of 90181320 is about 448.4412240016.

Adding to 90181320 its reverse (2318109), we get a palindrome (92499429).

The spelling of 90181320 in words is "ninety million, one hundred eighty-one thousand, three hundred twenty".