728673018 has 16 divisors (see below), whose sum is σ = 1457641440. Its totient is φ = 242841776.

The previous prime is 728673017. The next prime is 728673067. The reversal of 728673018 is 810376827.

It is a super-2 number, since 2×728673018² = 1061928734322456648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728673017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32068 + ... + 49856.

It is an arithmetic number, because the mean of its divisors is an integer number (91102590).

Almost surely, 2^728673018 is an apocalyptic number.

728673018 is an abundant number, since it is smaller than the sum of its proper divisors (728968422).

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

728673018 is a wasteful number, since it uses less digits than its factorization.

728673018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24621.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 728673018 is about 26993.9440986307. The cubic root of 728673018 is about 899.8654193828.

The spelling of 728673018 in words is "seven hundred twenty-eight million, six hundred seventy-three thousand, eighteen".