878457728 has 32 divisors (see below), whose sum is σ = 1853001360. Its totient is φ = 413390848.

The previous prime is 878457721. The next prime is 878457731. The reversal of 878457728 is 827754878.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878457721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199676 + ... + 204027.

Almost surely, 2^878457728 is an apocalyptic number.

It is an amenable number.

878457728 is an abundant number, since it is smaller than the sum of its proper divisors (974543632).

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

878457728 is a wasteful number, since it uses less digits than its factorization.

878457728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403734 (or 403722 counting only the distinct ones).

The product of its digits is 7024640, while the sum is 56.

The square root of 878457728 is about 29638.7875595477. The cubic root of 878457728 is about 957.7238203598.

The spelling of 878457728 in words is "eight hundred seventy-eight million, four hundred fifty-seven thousand, seven hundred twenty-eight".