1897945728 has 256 divisors, whose sum is σ = 5988003840. Its totient is φ = 521441280.

The previous prime is 1897945711. The next prime is 1897945733. The reversal of 1897945728 is 8275497981.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10485798 + ... + 10485978.

It is an arithmetic number, because the mean of its divisors is an integer number (23390640).

Almost surely, 2^1897945728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1897945728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2994001920).

1897945728 is an abundant number, since it is smaller than the sum of its proper divisors (4090058112).

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

1897945728 is a wasteful number, since it uses less digits than its factorization.

1897945728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 323 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 60.

The square root of 1897945728 is about 43565.4189466829. The cubic root of 1897945728 is about 1238.1157925349.

The spelling of 1897945728 in words is "one billion, eight hundred ninety-seven million, nine hundred forty-five thousand, seven hundred twenty-eight".