728511240 has 32 divisors (see below), whose sum is σ = 2185534080. Its totient is φ = 194269632.

The previous prime is 728511239. The next prime is 728511263. The reversal of 728511240 is 42115827.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 728511198 and 728511207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3035344 + ... + 3035583.

It is an arithmetic number, because the mean of its divisors is an integer number (68297940).

Almost surely, 2^728511240 is an apocalyptic number.

It is an amenable number.

728511240 is an abundant number, since it is smaller than the sum of its proper divisors (1457022840).

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

728511240 is a wasteful number, since it uses less digits than its factorization.

728511240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6070941 (or 6070937 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 728511240 is about 26990.9473712947. The cubic root of 728511240 is about 899.7988192301.

The spelling of 728511240 in words is "seven hundred twenty-eight million, five hundred eleven thousand, two hundred forty".