990128039355 has 288 divisors, whose sum is σ = 2209719343104. Its totient is φ = 416451829248.

The previous prime is 990128039321. The next prime is 990128039357. The reversal of 990128039355 is 553930821099.

990128039355 is a `hidden beast` number, since 9 + 9 + 0 + 1 + 280 + 3 + 9 + 355 = 666.

It is not a de Polignac number, because 990128039355 - 2⁶ = 990128039291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990128039357) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 527504677 + ... + 527506553.

It is an arithmetic number, because the mean of its divisors is an integer number (7672636608).

Almost surely, 2^990128039355 is an apocalyptic number.

990128039355 is an abundant number, since it is smaller than the sum of its proper divisors (1219591303749).

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

990128039355 is a wasteful number, since it uses less digits than its factorization.

990128039355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297 (or 2272 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The spelling of 990128039355 in words is "nine hundred ninety billion, one hundred twenty-eight million, thirty-nine thousand, three hundred fifty-five".