728222715 has 48 divisors (see below), whose sum is σ = 1414254816. Its totient is φ = 343526400.

The previous prime is 728222713. The next prime is 728222731. The reversal of 728222715 is 517222827.

It is not a de Polignac number, because 728222715 - 2¹ = 728222713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728222715.

It is not an unprimeable number, because it can be changed into a prime (728222713) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1566 + ... + 38195.

It is an arithmetic number, because the mean of its divisors is an integer number (29463642).

Almost surely, 2^728222715 is an apocalyptic number.

728222715 is a deficient number, since it is larger than the sum of its proper divisors (686032101).

728222715 is a wasteful number, since it uses less digits than its factorization.

728222715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39820 (or 39817 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 728222715 is about 26985.6019943969. The cubic root of 728222715 is about 899.6800158766.

The spelling of 728222715 in words is "seven hundred twenty-eight million, two hundred twenty-two thousand, seven hundred fifteen".