990975636 has 144 divisors (see below), whose sum is σ = 3019161600. Its totient is φ = 268073280.

The previous prime is 990975593. The next prime is 990975649. The reversal of 990975636 is 636579099.

It is a super-2 number, since 2×990975636² = 1964065422291208992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 365815 + ... + 368513.

It is an arithmetic number, because the mean of its divisors is an integer number (20966400).

Almost surely, 2^990975636 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 990975636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509580800).

990975636 is an abundant number, since it is smaller than the sum of its proper divisors (2028185964).

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

990975636 is a wasteful number, since it uses less digits than its factorization.

990975636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794 (or 2789 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 54.

The square root of 990975636 is about 31479.7655010326. The cubic root of 990975636 is about 996.9827842315.

The spelling of 990975636 in words is "nine hundred ninety million, nine hundred seventy-five thousand, six hundred thirty-six".