728888065145 has 4 divisors (see below), whose sum is σ = 874665678180. Its totient is φ = 583110452112.

The previous prime is 728888065109. The next prime is 728888065187. The reversal of 728888065145 is 541560888827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541560888827 = 7 ⋅77365841261.

It can be written as a sum of positive squares in 2 ways, for example, as 83931304681 + 644956760464 = 289709^2 + 803092^2 .

It is a cyclic number.

It is not a de Polignac number, because 728888065145 - 2²⁴ = 728871287929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72888806510 + ... + 72888806519.

It is an arithmetic number, because the mean of its divisors is an integer number (218666419545).

Almost surely, 2^728888065145 is an apocalyptic number.

It is an amenable number.

728888065145 is a deficient number, since it is larger than the sum of its proper divisors (145777613035).

728888065145 is a wasteful number, since it uses less digits than its factorization.

728888065145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145777613034.

The product of its (nonzero) digits is 34406400, while the sum is 62.

The spelling of 728888065145 in words is "seven hundred twenty-eight billion, eight hundred eighty-eight million, sixty-five thousand, one hundred forty-five".