1990728916 has 24 divisors (see below), whose sum is σ = 3828234816. Its totient is φ = 898269120.

The previous prime is 1990728889. The next prime is 1990728923. The reversal of 1990728916 is 6198270991.

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, 159096 + ... + 171151.

It is an arithmetic number, because the mean of its divisors is an integer number (159509784).

Almost surely, 2^1990728916 is an apocalyptic number.

It is an amenable number.

1990728916 is a deficient number, since it is larger than the sum of its proper divisors (1837505900).

1990728916 is a wasteful number, since it uses less digits than its factorization.

1990728916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330399 (or 330397 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 52.

The square root of 1990728916 is about 44617.5852775562. The cubic root of 1990728916 is about 1257.9712283096.

The spelling of 1990728916 in words is "one billion, nine hundred ninety million, seven hundred twenty-eight thousand, nine hundred sixteen".