728748720 has 120 divisors (see below), whose sum is σ = 2797026336. Its totient is φ = 166569984.

The previous prime is 728748703. The next prime is 728748731. The reversal of 728748720 is 27847827.

728748720 is a `hidden beast` number, since 72 + 87 + 487 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 67257 + ... + 77336.

Almost surely, 2^728748720 is an apocalyptic number.

728748720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

728748720 is an abundant number, since it is smaller than the sum of its proper divisors (2068277616).

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

728748720 is a wasteful number, since it uses less digits than its factorization.

728748720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144619 (or 144610 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 45.

The square root of 728748720 is about 26995.3462656066. The cubic root of 728748720 is about 899.8965807091.

The spelling of 728748720 in words is "seven hundred twenty-eight million, seven hundred forty-eight thousand, seven hundred twenty".