728223858 has 24 divisors (see below), whose sum is σ = 1636257168. Its totient is φ = 242741124.

The previous prime is 728223841. The next prime is 728223913. The reversal of 728223858 is 858322827.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 748716 + ... + 749687.

It is an arithmetic number, because the mean of its divisors is an integer number (68177382).

Almost surely, 2^728223858 is an apocalyptic number.

728223858 is an abundant number, since it is smaller than the sum of its proper divisors (908033310).

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

728223858 is a wasteful number, since it uses less digits than its factorization.

728223858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498420 (or 1498408 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 728223858 is about 26985.6231723486. The cubic root of 728223858 is about 899.6804865814.

The spelling of 728223858 in words is "seven hundred twenty-eight million, two hundred twenty-three thousand, eight hundred fifty-eight".