728721552 has 40 divisors (see below), whose sum is σ = 2027342464. Its totient is φ = 224221824.

The previous prime is 728721533. The next prime is 728721563. The reversal of 728721552 is 255127827.

728721552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 728721552.

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, 583288 + ... + 584535.

Almost surely, 2^728721552 is an apocalyptic number.

It is an amenable number.

728721552 is an abundant number, since it is smaller than the sum of its proper divisors (1298620912).

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

728721552 is a wasteful number, since it uses less digits than its factorization.

728721552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167847 (or 1167841 counting only the distinct ones).

The product of its digits is 78400, while the sum is 39.

The square root of 728721552 is about 26994.8430630741. The cubic root of 728721552 is about 899.8853977533.

The spelling of 728721552 in words is "seven hundred twenty-eight million, seven hundred twenty-one thousand, five hundred fifty-two".