90218870 has 32 divisors (see below), whose sum is σ = 186755328. Its totient is φ = 30738528.

The previous prime is 90218851. The next prime is 90218873. The reversal of 90218870 is 7881209.

It is a happy number.

It is a super-3 number, since 3×90218870³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 90218870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90218873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7457 + ... + 15363.

It is an arithmetic number, because the mean of its divisors is an integer number (5836104).

Almost surely, 2^90218870 is an apocalyptic number.

90218870 is an abundant number, since it is smaller than the sum of its proper divisors (96536458).

90218870 is a wasteful number, since it uses less digits than its factorization.

90218870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8084.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 90218870 is about 9498.3614376375. The cubic root of 90218870 is about 448.5034565177.

The spelling of 90218870 in words is "ninety million, two hundred eighteen thousand, eight hundred seventy".