728663107 has 4 divisors (see below), whose sum is σ = 729944280. Its totient is φ = 727381936.

The previous prime is 728663101. The next prime is 728663141. The reversal of 728663107 is 701366827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728663107 - 2¹⁵ = 728630339 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728663107.

It is not an unprimeable number, because it can be changed into a prime (728663101) 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, 639733 + ... + 640870.

It is an arithmetic number, because the mean of its divisors is an integer number (182486070).

Almost surely, 2^728663107 is an apocalyptic number.

728663107 is a deficient number, since it is larger than the sum of its proper divisors (1281173).

728663107 is a wasteful number, since it uses less digits than its factorization.

728663107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281172.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 728663107 is about 26993.7605197942. The cubic root of 728663107 is about 899.8613395434.

The spelling of 728663107 in words is "seven hundred twenty-eight million, six hundred sixty-three thousand, one hundred seven".