990779427 has 12 divisors (see below), whose sum is σ = 1561228344. Its totient is φ = 600472320.

The previous prime is 990779401. The next prime is 990779443. The reversal of 990779427 is 724977099.

It is not a de Polignac number, because 990779427 - 2⁷ = 990779299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990779467) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5003838 + ... + 5004035.

It is an arithmetic number, because the mean of its divisors is an integer number (130102362).

Almost surely, 2^990779427 is an apocalyptic number.

990779427 is a deficient number, since it is larger than the sum of its proper divisors (570448917).

990779427 is a wasteful number, since it uses less digits than its factorization.

990779427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10007890 (or 10007887 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The square root of 990779427 is about 31476.6489162998. The cubic root of 990779427 is about 996.9169804250.

The spelling of 990779427 in words is "nine hundred ninety million, seven hundred seventy-nine thousand, four hundred twenty-seven".