728393540 has 24 divisors (see below), whose sum is σ = 1748144832. Its totient is φ = 249734880.

The previous prime is 728393537. The next prime is 728393579. The reversal of 728393540 is 45393827.

728393540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×728393540² = 1061114298227463200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2601266 + ... + 2601545.

It is an arithmetic number, because the mean of its divisors is an integer number (72839368).

Almost surely, 2^728393540 is an apocalyptic number.

728393540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

728393540 is an abundant number, since it is smaller than the sum of its proper divisors (1019751292).

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

728393540 is a wasteful number, since it uses less digits than its factorization.

728393540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5202827 (or 5202825 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 728393540 is about 26988.7669225550. The cubic root of 728393540 is about 899.7503587447.

The spelling of 728393540 in words is "seven hundred twenty-eight million, three hundred ninety-three thousand, five hundred forty".