990565863 has 32 divisors (see below), whose sum is σ = 1613509632. Its totient is φ = 528211200.

The previous prime is 990565859. The next prime is 990565867. The reversal of 990565863 is 368565099.

It is an interprime number because it is at equal distance from previous prime (990565859) and next prime (990565867).

It is not a de Polignac number, because 990565863 - 2² = 990565859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990565867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5208 + ... + 44813.

It is an arithmetic number, because the mean of its divisors is an integer number (50422176).

Almost surely, 2^990565863 is an apocalyptic number.

990565863 is a deficient number, since it is larger than the sum of its proper divisors (622943769).

990565863 is a wasteful number, since it uses less digits than its factorization.

990565863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50095.

The product of its (nonzero) digits is 1749600, while the sum is 51.

The square root of 990565863 is about 31473.2563138929. The cubic root of 990565863 is about 996.8453462915.

The spelling of 990565863 in words is "nine hundred ninety million, five hundred sixty-five thousand, eight hundred sixty-three".