728671420 has 12 divisors (see below), whose sum is σ = 1530210024. Its totient is φ = 291468560.

The previous prime is 728671397. The next prime is 728671423. The reversal of 728671420 is 24176827.

It is a self number, because there is not a number n which added to its sum of digits gives 728671420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728671423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18216766 + ... + 18216805.

It is an arithmetic number, because the mean of its divisors is an integer number (127517502).

Almost surely, 2^728671420 is an apocalyptic number.

It is an amenable number.

728671420 is an abundant number, since it is smaller than the sum of its proper divisors (801538604).

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

728671420 is a wasteful number, since it uses less digits than its factorization.

728671420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36433580 (or 36433578 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 728671420 is about 26993.9144993830. The cubic root of 728671420 is about 899.8647615724.

The spelling of 728671420 in words is "seven hundred twenty-eight million, six hundred seventy-one thousand, four hundred twenty".