720139728 has 120 divisors (see below), whose sum is σ = 2337114304. Its totient is φ = 187038720.

The previous prime is 720139727. The next prime is 720139753. The reversal of 720139728 is 827931027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720139727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31800 + ... + 49512.

Almost surely, 2^720139728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720139728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1168557152).

720139728 is an abundant number, since it is smaller than the sum of its proper divisors (1616974576).

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

720139728 is a wasteful number, since it uses less digits than its factorization.

720139728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17753 (or 17736 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 720139728 is about 26835.4192812410. The cubic root of 720139728 is about 896.3389249800.

The spelling of 720139728 in words is "seven hundred twenty million, one hundred thirty-nine thousand, seven hundred twenty-eight".