728122045 has 8 divisors (see below), whose sum is σ = 998567424. Its totient is φ = 499283664.

The previous prime is 728122037. The next prime is 728122049. The reversal of 728122045 is 540221827.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728122045 - 2³ = 728122037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728121998 and 728122016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728122049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10401709 + ... + 10401778.

It is an arithmetic number, because the mean of its divisors is an integer number (124820928).

Almost surely, 2^728122045 is an apocalyptic number.

It is an amenable number.

728122045 is a deficient number, since it is larger than the sum of its proper divisors (270445379).

728122045 is a wasteful number, since it uses less digits than its factorization.

728122045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20803499.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 728122045 is about 26983.7366760054. The cubic root of 728122045 is about 899.6385565084.

The spelling of 728122045 in words is "seven hundred twenty-eight million, one hundred twenty-two thousand, forty-five".