728705822 has 16 divisors (see below), whose sum is σ = 1239095760. Its totient is φ = 318624192.

The previous prime is 728705801. The next prime is 728705827. The reversal of 728705822 is 228507827.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 728705822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728705827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737063 + ... + 738050.

It is an arithmetic number, because the mean of its divisors is an integer number (77443485).

Almost surely, 2^728705822 is an apocalyptic number.

728705822 is a deficient number, since it is larger than the sum of its proper divisors (510389938).

728705822 is a wasteful number, since it uses less digits than its factorization.

728705822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475147.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 728705822 is about 26994.5517095580. The cubic root of 728705822 is about 899.8789228068.

The spelling of 728705822 in words is "seven hundred twenty-eight million, seven hundred five thousand, eight hundred twenty-two".