90387218 has 16 divisors (see below), whose sum is σ = 144528000. Its totient is φ = 42271632.

The previous prime is 90387211. The next prime is 90387239. The reversal of 90387218 is 81278309.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90387211) 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, 12053 + ... + 18056.

It is an arithmetic number, because the mean of its divisors is an integer number (9033000).

Almost surely, 2^90387218 is an apocalyptic number.

90387218 is a deficient number, since it is larger than the sum of its proper divisors (54140782).

90387218 is a wasteful number, since it uses less digits than its factorization.

90387218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30209.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 90387218 is about 9507.2192569647. The cubic root of 90387218 is about 448.7822516476.

The spelling of 90387218 in words is "ninety million, three hundred eighty-seven thousand, two hundred eighteen".