728623140 has 144 divisors (see below), whose sum is σ = 2424183552. Its totient is φ = 162968064.

The previous prime is 728623139. The next prime is 728623151. The reversal of 728623140 is 41326827.

728623140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135544 + ... + 140816.

It is an arithmetic number, because the mean of its divisors is an integer number (16834608).

Almost surely, 2^728623140 is an apocalyptic number.

728623140 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 728623140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1212091776).

728623140 is an abundant number, since it is smaller than the sum of its proper divisors (1695560412).

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

728623140 is a wasteful number, since it uses less digits than its factorization.

728623140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5346 (or 5337 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 728623140 is about 26993.0202089355. The cubic root of 728623140 is about 899.8448868483.

Adding to 728623140 its reverse (41326827), we get a palindrome (769949967).

The spelling of 728623140 in words is "seven hundred twenty-eight million, six hundred twenty-three thousand, one hundred forty".