728171155 has 4 divisors (see below), whose sum is σ = 873805392. Its totient is φ = 582536920.

The previous prime is 728171153. The next prime is 728171177. The reversal of 728171155 is 551171827.

It is a happy number.

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

It is not a de Polignac number, because 728171155 - 2¹ = 728171153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728171153) 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, 72817111 + ... + 72817120.

It is an arithmetic number, because the mean of its divisors is an integer number (218451348).

Almost surely, 2^728171155 is an apocalyptic number.

728171155 is a deficient number, since it is larger than the sum of its proper divisors (145634237).

728171155 is a wasteful number, since it uses less digits than its factorization.

728171155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145634236.

The product of its digits is 19600, while the sum is 37.

The square root of 728171155 is about 26984.6466532360. The cubic root of 728171155 is about 899.6587821728.

The spelling of 728171155 in words is "seven hundred twenty-eight million, one hundred seventy-one thousand, one hundred fifty-five".