728891320 has 32 divisors (see below), whose sum is σ = 1736478000. Its totient is φ = 274405888.

The previous prime is 728891299. The next prime is 728891329. The reversal of 728891320 is 23198827.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728891329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535270 + ... + 536629.

Almost surely, 2^728891320 is an apocalyptic number.

It is an amenable number.

728891320 is an abundant number, since it is smaller than the sum of its proper divisors (1007586680).

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

728891320 is a wasteful number, since it uses less digits than its factorization.

728891320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071927 (or 1071923 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 728891320 is about 26997.9873323920. The cubic root of 728891320 is about 899.9552734975.

The spelling of 728891320 in words is "seven hundred twenty-eight million, eight hundred ninety-one thousand, three hundred twenty".