90218425 has 12 divisors (see below), whose sum is σ = 122041296. Its totient is φ = 65613200.

The previous prime is 90218413. The next prime is 90218459. The reversal of 90218425 is 52481209.

It is not a de Polignac number, because 90218425 - 2¹⁵ = 90185657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163759 + ... + 164308.

It is an arithmetic number, because the mean of its divisors is an integer number (10170108).

Almost surely, 2^90218425 is an apocalyptic number.

It is an amenable number.

90218425 is a deficient number, since it is larger than the sum of its proper divisors (31822871).

90218425 is a wasteful number, since it uses less digits than its factorization.

90218425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328088 (or 328083 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 90218425 is about 9498.3380125157. The cubic root of 90218425 is about 448.5027191096.

It can be divided in two parts, 902184 and 25, that added together give a palindrome (902209).

The spelling of 90218425 in words is "ninety million, two hundred eighteen thousand, four hundred twenty-five".