1990825128 has 48 divisors (see below), whose sum is σ = 5591520480. Its totient is φ = 663607728.

The previous prime is 1990825049. The next prime is 1990825129. The reversal of 1990825128 is 8215280991.

It is not an unprimeable number, because it can be changed into a prime (1990825129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 510100 + ... + 513987.

It is an arithmetic number, because the mean of its divisors is an integer number (116490010).

Almost surely, 2^1990825128 is an apocalyptic number.

1990825128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1990825128 is an abundant number, since it is smaller than the sum of its proper divisors (3600695352).

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

1990825128 is a wasteful number, since it uses less digits than its factorization.

1990825128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024108 (or 1024092 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1990825128 is about 44618.6634492787. The cubic root of 1990825128 is about 1257.9914939147.

The spelling of 1990825128 in words is "one billion, nine hundred ninety million, eight hundred twenty-five thousand, one hundred twenty-eight".