990234090 has 48 divisors (see below), whose sum is σ = 2576247336. Its totient is φ = 263894400.

The previous prime is 990234053. The next prime is 990234097. The reversal of 990234090 is 90432099.

It can be written as a sum of positive squares in 4 ways, for example, as 376631649 + 613602441 = 19407^2 + 24771^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (990234097) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211980 + ... + 216600.

Almost surely, 2^990234090 is an apocalyptic number.

990234090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

990234090 is an abundant number, since it is smaller than the sum of its proper divisors (1586013246).

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

990234090 is a wasteful number, since it uses less digits than its factorization.

990234090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7015 (or 7012 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 990234090 is about 31467.9851595236. The cubic root of 990234090 is about 996.7340417958.

The spelling of 990234090 in words is "nine hundred ninety million, two hundred thirty-four thousand, ninety".