90831000 has 256 divisors, whose sum is σ = 325503360. Its totient is φ = 20889600.

The previous prime is 90830989. The next prime is 90831019. The reversal of 90831000 is 13809.

It is a super-2 number, since 2×90831000² = 16500541122000000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 662932 + ... + 663068.

Almost surely, 2^90831000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90831000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162751680).

90831000 is an abundant number, since it is smaller than the sum of its proper divisors (234672360).

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

90831000 is a wasteful number, since it uses less digits than its factorization.

90831000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 90831000 is about 9530.5298908298. The cubic root of 90831000 is about 449.5155279852.

Adding to 90831000 its reverse (13809), we get a palindrome (90844809).

The spelling of 90831000 in words is "ninety million, eight hundred thirty-one thousand".