90821738 has 8 divisors (see below), whose sum is σ = 155694432. Its totient is φ = 38923596.

The previous prime is 90821737. The next prime is 90821749. The reversal of 90821738 is 83712809.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (90821737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3243620 + ... + 3243647.

It is an arithmetic number, because the mean of its divisors is an integer number (19461804).

Almost surely, 2^90821738 is an apocalyptic number.

90821738 is a deficient number, since it is larger than the sum of its proper divisors (64872694).

90821738 is a wasteful number, since it uses less digits than its factorization.

90821738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6487276.

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

The square root of 90821738 is about 9530.0439663204. The cubic root of 90821738 is about 449.5002484942.

The spelling of 90821738 in words is "ninety million, eight hundred twenty-one thousand, seven hundred thirty-eight".