1681927728 has 80 divisors (see below), whose sum is σ = 4925518080. Its totient is φ = 490275072.

The previous prime is 1681927727. The next prime is 1681927763. The reversal of 1681927728 is 8277291861.

It is not an unprimeable number, because it can be changed into a prime (1681927721) 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, 59076 + ... + 82787.

It is an arithmetic number, because the mean of its divisors is an integer number (61568976).

Almost surely, 2^1681927728 is an apocalyptic number.

It is an amenable number.

1681927728 is an abundant number, since it is smaller than the sum of its proper divisors (3243590352).

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

1681927728 is a wasteful number, since it uses less digits than its factorization.

1681927728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141906 (or 141900 counting only the distinct ones).

The product of its digits is 677376, while the sum is 51.

The square root of 1681927728 is about 41011.3121955394. The cubic root of 1681927728 is about 1189.2389097966.

The spelling of 1681927728 in words is "one billion, six hundred eighty-one million, nine hundred twenty-seven thousand, seven hundred twenty-eight".