728072728 has 16 divisors (see below), whose sum is σ = 1424490480. Its totient is φ = 348208608.

The previous prime is 728072707. The next prime is 728072729. The reversal of 728072728 is 827270827.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728072729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978275 + ... + 1978642.

It is an arithmetic number, because the mean of its divisors is an integer number (89030655).

Almost surely, 2^728072728 is an apocalyptic number.

It is an amenable number.

728072728 is a deficient number, since it is larger than the sum of its proper divisors (696417752).

728072728 is a wasteful number, since it uses less digits than its factorization.

728072728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956946 (or 3956942 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 728072728 is about 26982.8228323132. The cubic root of 728072728 is about 899.6182446771.

It can be divided in two parts, 7280 and 72728, that added together give a palindrome (80008).

The spelling of 728072728 in words is "seven hundred twenty-eight million, seventy-two thousand, seven hundred twenty-eight".