28623129565 has 8 divisors (see below), whose sum is σ = 34481405880. Its totient is φ = 22809403392.

The previous prime is 28623129559. The next prime is 28623129569. The reversal of 28623129565 is 56592132682.

It can be written as a sum of positive squares in 4 ways, for example, as 3655653444 + 24967476121 = 60462^2 + 158011^2 .

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 28623129565 - 2²⁹ = 28086258653 is a prime.

It is a super-4 number, since 4×28623129565⁴ (a number of 43 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28623129569) 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, 11136120 + ... + 11138689.

It is an arithmetic number, because the mean of its divisors is an integer number (4310175735).

Almost surely, 2^28623129565 is an apocalyptic number.

It is an amenable number.

28623129565 is a deficient number, since it is larger than the sum of its proper divisors (5858276315).

28623129565 is a wasteful number, since it uses less digits than its factorization.

28623129565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22275071.

The product of its digits is 1555200, while the sum is 49.

The spelling of 28623129565 in words is "twenty-eight billion, six hundred twenty-three million, one hundred twenty-nine thousand, five hundred sixty-five".