90989238 has 16 divisors (see below), whose sum is σ = 182162736. Its totient is φ = 30299040.

The previous prime is 90989231. The next prime is 90989251. The reversal of 90989238 is 83298909.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90989231) 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, 781 + ... + 13512.

It is an arithmetic number, because the mean of its divisors is an integer number (11385171).

Almost surely, 2^90989238 is an apocalyptic number.

90989238 is an abundant number, since it is smaller than the sum of its proper divisors (91173498).

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

90989238 is a wasteful number, since it uses less digits than its factorization.

90989238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15359.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 90989238 is about 9538.8279154202. The cubic root of 90989238 is about 449.7764123831.

It can be divided in two parts, 9098 and 9238, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 90989238 in words is "ninety million, nine hundred eighty-nine thousand, two hundred thirty-eight".