990099778 has 16 divisors (see below), whose sum is σ = 1493402400. Its totient is φ = 492307200.

The previous prime is 990099767. The next prime is 990099797. The reversal of 990099778 is 877990099.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295573 + ... + 298903.

It is an arithmetic number, because the mean of its divisors is an integer number (93337650).

Almost surely, 2^990099778 is an apocalyptic number.

990099778 is a deficient number, since it is larger than the sum of its proper divisors (503302622).

990099778 is a wasteful number, since it uses less digits than its factorization.

990099778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113.

The product of its (nonzero) digits is 2571912, while the sum is 58.

The square root of 990099778 is about 31465.8509816595. The cubic root of 990099778 is about 996.6889752143.

The spelling of 990099778 in words is "nine hundred ninety million, ninety-nine thousand, seven hundred seventy-eight".