990251288 has 16 divisors (see below), whose sum is σ = 1999546080. Its totient is φ = 457039008.

The previous prime is 990251287. The next prime is 990251299. The reversal of 990251288 is 882152099.

It is a super-2 number, since 2×990251288² = 1961195226771317888, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990251287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4760720 + ... + 4760927.

It is an arithmetic number, because the mean of its divisors is an integer number (124971630).

Almost surely, 2^990251288 is an apocalyptic number.

It is an amenable number.

990251288 is an abundant number, since it is smaller than the sum of its proper divisors (1009294792).

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

990251288 is a wasteful number, since it uses less digits than its factorization.

990251288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9521666 (or 9521662 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 990251288 is about 31468.2584201922. The cubic root of 990251288 is about 996.7398120586.

The spelling of 990251288 in words is "nine hundred ninety million, two hundred fifty-one thousand, two hundred eighty-eight".