728674781 has 16 divisors (see below), whose sum is σ = 763975104. Its totient is φ = 694324224.

The previous prime is 728674777. The next prime is 728674783. The reversal of 728674781 is 187476827.

It is a cyclic number.

It is not a de Polignac number, because 728674781 - 2² = 728674777 is a prime.

It is a super-2 number, since 2×728674781² = 1061933872930795922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728674783) 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 15 ways as a sum of consecutive naturals, for example, 477686 + ... + 479208.

It is an arithmetic number, because the mean of its divisors is an integer number (47748444).

Almost surely, 2^728674781 is an apocalyptic number.

It is an amenable number.

728674781 is a deficient number, since it is larger than the sum of its proper divisors (35300323).

728674781 is a wasteful number, since it uses less digits than its factorization.

728674781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820.

The product of its digits is 1053696, while the sum is 50.

The square root of 728674781 is about 26993.9767540835. The cubic root of 728674781 is about 899.8661451136.

The spelling of 728674781 in words is "seven hundred twenty-eight million, six hundred seventy-four thousand, seven hundred eighty-one".