90321816 has 64 divisors (see below), whose sum is σ = 257493600. Its totient is φ = 26155008.

The previous prime is 90321797. The next prime is 90321821. The reversal of 90321816 is 61812309.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3211 + ... + 13818.

Almost surely, 2^90321816 is an apocalyptic number.

It is an amenable number.

90321816 is an abundant number, since it is smaller than the sum of its proper divisors (167171784).

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

90321816 is a wasteful number, since it uses less digits than its factorization.

90321816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17068 (or 17064 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 90321816 is about 9503.7790378354. The cubic root of 90321816 is about 448.6739828768.

The spelling of 90321816 in words is "ninety million, three hundred twenty-one thousand, eight hundred sixteen".