990928663 has 2 divisors, whose sum is σ = 990928664. Its totient is φ = 990928662.

The previous prime is 990928643. The next prime is 990928667. The reversal of 990928663 is 366829099.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990928663 - 2⁹ = 990928151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990928663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990928667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495464331 + 495464332.

It is an arithmetic number, because the mean of its divisors is an integer number (495464332).

Almost surely, 2^990928663 is an apocalyptic number.

990928663 is a deficient number, since it is larger than the sum of its proper divisors (1).

990928663 is an equidigital number, since it uses as much as digits as its factorization.

990928663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 990928663 is about 31479.0194097593. The cubic root of 990928663 is about 996.9670314015.

The spelling of 990928663 in words is "nine hundred ninety million, nine hundred twenty-eight thousand, six hundred sixty-three".