728161826 has 16 divisors (see below), whose sum is σ = 1249984320. Its totient is φ = 311642640.

The previous prime is 728161817. The next prime is 728161843. The reversal of 728161826 is 628161827.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24845 + ... + 45536.

It is an arithmetic number, because the mean of its divisors is an integer number (78124020).

Almost surely, 2^728161826 is an apocalyptic number.

728161826 is a deficient number, since it is larger than the sum of its proper divisors (521822494).

728161826 is a wasteful number, since it uses less digits than its factorization.

728161826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71129.

The product of its digits is 64512, while the sum is 41.

The square root of 728161826 is about 26984.4737951289. The cubic root of 728161826 is about 899.6549401490.

Subtracting from 728161826 its reverse (628161827), we obtain a palindrome (99999999).

The spelling of 728161826 in words is "seven hundred twenty-eight million, one hundred sixty-one thousand, eight hundred twenty-six".