90818240 has 28 divisors (see below), whose sum is σ = 216261696. Its totient is φ = 36327168.

The previous prime is 90818219. The next prime is 90818243. The reversal of 90818240 is 4281809.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 90818197 and 90818206.

It is not an unprimeable number, because it can be changed into a prime (90818243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141584 + ... + 142223.

It is an arithmetic number, because the mean of its divisors is an integer number (7723632).

Almost surely, 2^90818240 is an apocalyptic number.

It is an amenable number.

90818240 is an abundant number, since it is smaller than the sum of its proper divisors (125443456).

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

90818240 is a wasteful number, since it uses less digits than its factorization.

90818240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283824 (or 283814 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 90818240 is about 9529.8604396917. The cubic root of 90818240 is about 449.4944775848.

The spelling of 90818240 in words is "ninety million, eight hundred eighteen thousand, two hundred forty".