990516378 has 16 divisors (see below), whose sum is σ = 2006110080. Its totient is φ = 325992576.

The previous prime is 990516347. The next prime is 990516383. The reversal of 990516378 is 873615099.

It is a super-2 number, since 2×990516378² = 1962245390172477768, 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 7 ways as a sum of consecutive naturals, for example, 1044375 + ... + 1045322.

It is an arithmetic number, because the mean of its divisors is an integer number (125381880).

Almost surely, 2^990516378 is an apocalyptic number.

990516378 is an abundant number, since it is smaller than the sum of its proper divisors (1015593702).

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

990516378 is a wasteful number, since it uses less digits than its factorization.

990516378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089781.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 990516378 is about 31472.4701604434. The cubic root of 990516378 is about 996.8287464485.

The spelling of 990516378 in words is "nine hundred ninety million, five hundred sixteen thousand, three hundred seventy-eight".