990255478 has 16 divisors (see below), whose sum is σ = 1552692960. Its totient is φ = 472766976.

The previous prime is 990255467. The next prime is 990255503. The reversal of 990255478 is 874552099.

990255478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 7888 + ... + 45196.

It is an arithmetic number, because the mean of its divisors is an integer number (97043310).

Almost surely, 2^990255478 is an apocalyptic number.

990255478 is a deficient number, since it is larger than the sum of its proper divisors (562437482).

990255478 is a wasteful number, since it uses less digits than its factorization.

990255478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37911.

The product of its (nonzero) digits is 907200, while the sum is 49.

The square root of 990255478 is about 31468.3249951439. The cubic root of 990255478 is about 996.7412178748.

The spelling of 990255478 in words is "nine hundred ninety million, two hundred fifty-five thousand, four hundred seventy-eight".