728173153 has 4 divisors (see below), whose sum is σ = 728315028. Its totient is φ = 728031280.

The previous prime is 728173139. The next prime is 728173181. The reversal of 728173153 is 351371827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 351371827 = 17 ⋅20668931.

It can be written as a sum of positive squares in 2 ways, for example, as 428986944 + 299186209 = 20712^2 + 17297^2 .

It is a cyclic number.

It is not a de Polignac number, because 728173153 - 2²⁵ = 694618721 is a prime.

It is a super-3 number, since 3×728173153³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 62938 + ... + 73603.

It is an arithmetic number, because the mean of its divisors is an integer number (182078757).

Almost surely, 2^728173153 is an apocalyptic number.

It is an amenable number.

728173153 is a deficient number, since it is larger than the sum of its proper divisors (141875).

728173153 is a wasteful number, since it uses less digits than its factorization.

728173153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141874.

The product of its digits is 35280, while the sum is 37.

The square root of 728173153 is about 26984.6836742623. The cubic root of 728173153 is about 899.6596050180.

The spelling of 728173153 in words is "seven hundred twenty-eight million, one hundred seventy-three thousand, one hundred fifty-three".