990571128 has 32 divisors (see below), whose sum is σ = 2478470400. Its totient is φ = 329918048.

The previous prime is 990571123. The next prime is 990571159. The reversal of 990571128 is 821175099.

It is a self number, because there is not a number n which added to its sum of digits gives 990571128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990571123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13825 + ... + 46607.

It is an arithmetic number, because the mean of its divisors is an integer number (77452200).

Almost surely, 2^990571128 is an apocalyptic number.

It is an amenable number.

990571128 is an abundant number, since it is smaller than the sum of its proper divisors (1487899272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990571128 is a wasteful number, since it uses less digits than its factorization.

990571128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34051 (or 34047 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 990571128 is about 31473.3399562233. The cubic root of 990571128 is about 996.8471124138.

The spelling of 990571128 in words is "nine hundred ninety million, five hundred seventy-one thousand, one hundred twenty-eight".