1920891728 has 30 divisors (see below), whose sum is σ = 4329358506. Its totient is φ = 823238976.

The previous prime is 1920891701. The next prime is 1920891787. The reversal of 1920891728 is 8271980291.

It can be written as a sum of positive squares in only one way, i.e., 1420385344 + 500506384 = 37688^2 + 22372^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1224275 + ... + 1225842.

Almost surely, 2^1920891728 is an apocalyptic number.

It is an amenable number.

1920891728 is an abundant number, since it is smaller than the sum of its proper divisors (2408466778).

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

1920891728 is a wasteful number, since it uses less digits than its factorization.

1920891728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450139 (or 2450126 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 1920891728 is about 43827.9788263160. The cubic root of 1920891728 is about 1243.0853896996.

The spelling of 1920891728 in words is "one billion, nine hundred twenty million, eight hundred ninety-one thousand, seven hundred twenty-eight".