990881255 has 64 divisors (see below), whose sum is σ = 1566566400. Its totient is φ = 584133120.

The previous prime is 990881219. The next prime is 990881257. The reversal of 990881255 is 552188099.

It is not a de Polignac number, because 990881255 - 2⁶ = 990881191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990881257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 526406 + ... + 528284.

It is an arithmetic number, because the mean of its divisors is an integer number (24477600).

Almost surely, 2^990881255 is an apocalyptic number.

990881255 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

990881255 is a deficient number, since it is larger than the sum of its proper divisors (575685145).

990881255 is a wasteful number, since it uses less digits than its factorization.

990881255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984.

The product of its (nonzero) digits is 259200, while the sum is 47.

The square root of 990881255 is about 31478.2663912738. The cubic root of 990881255 is about 996.9511321854.

The spelling of 990881255 in words is "nine hundred ninety million, eight hundred eighty-one thousand, two hundred fifty-five".