728749947826 has 4 divisors (see below), whose sum is σ = 1093124921742. Its totient is φ = 364374973912.

The previous prime is 728749947671. The next prime is 728749947839. The reversal of 728749947826 is 628749947827.

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

It can be written as a sum of positive squares in only one way, i.e., 691556896801 + 37193051025 = 831599^2 + 192855^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182187486955 + ... + 182187486958.

Almost surely, 2^728749947826 is an apocalyptic number.

728749947826 is a deficient number, since it is larger than the sum of its proper divisors (364374973916).

728749947826 is a wasteful number, since it uses less digits than its factorization.

728749947826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364374973915.

The product of its digits is 682795008, while the sum is 73.

Subtracting from 728749947826 its reverse (628749947827), we obtain a palindrome (99999999999).

The spelling of 728749947826 in words is "seven hundred twenty-eight billion, seven hundred forty-nine million, nine hundred forty-seven thousand, eight hundred twenty-six".