990517028 has 12 divisors (see below), whose sum is σ = 1734297180. Its totient is φ = 495003552.

The previous prime is 990517013. The next prime is 990517037. The reversal of 990517028 is 820715099.

It can be written as a sum of positive squares in 2 ways, for example, as 647600704 + 342916324 = 25448^2 + 18518^2 .

It is a super-2 number, since 2×990517028² = 1962247965515905568, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 54863 + ... + 70646.

It is an arithmetic number, because the mean of its divisors is an integer number (144524765).

Almost surely, 2^990517028 is an apocalyptic number.

It is an amenable number.

990517028 is a deficient number, since it is larger than the sum of its proper divisors (743780152).

990517028 is a wasteful number, since it uses less digits than its factorization.

990517028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127486 (or 127484 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 990517028 is about 31472.4804869270. The cubic root of 990517028 is about 996.8289644959.

The spelling of 990517028 in words is "nine hundred ninety million, five hundred seventeen thousand, twenty-eight".