728223151 has 4 divisors (see below), whose sum is σ = 728295400. Its totient is φ = 728150904.

The previous prime is 728223131. The next prime is 728223157. The reversal of 728223151 is 151322827.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 728223151 - 2¹⁵ = 728190383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728223157) 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, 17961 + ... + 42178.

It is an arithmetic number, because the mean of its divisors is an integer number (182073850).

Almost surely, 2^728223151 is an apocalyptic number.

728223151 is a deficient number, since it is larger than the sum of its proper divisors (72249).

728223151 is a wasteful number, since it uses less digits than its factorization.

728223151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72248.

The product of its digits is 6720, while the sum is 31.

The square root of 728223151 is about 26985.6100727777. The cubic root of 728223151 is about 899.6801954281.

Adding to 728223151 its reverse (151322827), we get a palindrome (879545978).

The spelling of 728223151 in words is "seven hundred twenty-eight million, two hundred twenty-three thousand, one hundred fifty-one".