1990558028 has 48 divisors (see below), whose sum is σ = 3804864000. Its totient is φ = 907599168.

The previous prime is 1990558027. The next prime is 1990558061. The reversal of 1990558028 is 8208550991.

It is not an unprimeable number, because it can be changed into a prime (1990558027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 834125 + ... + 836507.

It is an arithmetic number, because the mean of its divisors is an integer number (79268000).

Almost surely, 2^1990558028 is an apocalyptic number.

It is an amenable number.

1990558028 is a deficient number, since it is larger than the sum of its proper divisors (1814305972).

1990558028 is a wasteful number, since it uses less digits than its factorization.

1990558028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2814 (or 2812 counting only the distinct ones).

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

The square root of 1990558028 is about 44615.6702067782. The cubic root of 1990558028 is about 1257.9352317228.

The spelling of 1990558028 in words is "one billion, nine hundred ninety million, five hundred fifty-eight thousand, twenty-eight".