1980431728 has 40 divisors (see below), whose sum is σ = 4432149360. Its totient is φ = 847242240.

The previous prime is 1980431723. The next prime is 1980431729. The reversal of 1980431728 is 8271340891.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980431723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327963 + ... + 333946.

It is an arithmetic number, because the mean of its divisors is an integer number (110803734).

Almost surely, 2^1980431728 is an apocalyptic number.

It is an amenable number.

1980431728 is an abundant number, since it is smaller than the sum of its proper divisors (2451717632).

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

1980431728 is a wasteful number, since it uses less digits than its factorization.

1980431728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661945 (or 661939 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1980431728 is about 44502.0418407965. The cubic root of 1980431728 is about 1255.7984956735.

The spelling of 1980431728 in words is "one billion, nine hundred eighty million, four hundred thirty-one thousand, seven hundred twenty-eight".