1988994728 has 16 divisors (see below), whose sum is σ = 4262131680. Its totient is φ = 852426288.

The previous prime is 1988994697. The next prime is 1988994737. The reversal of 1988994728 is 8274998891.

It is a super-2 number, since 2×1988994728² = 7912200056023587968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17758826 + ... + 17758937.

It is an arithmetic number, because the mean of its divisors is an integer number (266383230).

Almost surely, 2^1988994728 is an apocalyptic number.

It is an amenable number.

1988994728 is an abundant number, since it is smaller than the sum of its proper divisors (2273136952).

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

1988994728 is a wasteful number, since it uses less digits than its factorization.

1988994728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35517776 (or 35517772 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 65.

The square root of 1988994728 is about 44598.1471364002. The cubic root of 1988994728 is about 1257.6058357855.

The spelling of 1988994728 in words is "one billion, nine hundred eighty-eight million, nine hundred ninety-four thousand, seven hundred twenty-eight".