28165525869 has 16 divisors (see below), whose sum is σ = 40446713664. Its totient is φ = 17330956800.

The previous prime is 28165525853. The next prime is 28165525877. The reversal of 28165525869 is 96852556182.

It is a happy number.

It is not a de Polignac number, because 28165525869 - 2⁴ = 28165525853 is a prime.

It is a super-2 number, since 2×28165525869² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28165525849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464434 + ... + 521564.

It is an arithmetic number, because the mean of its divisors is an integer number (2527919604).

Almost surely, 2^28165525869 is an apocalyptic number.

It is an amenable number.

28165525869 is a deficient number, since it is larger than the sum of its proper divisors (12281187795).

28165525869 is a wasteful number, since it uses less digits than its factorization.

28165525869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69788.

The product of its digits is 10368000, while the sum is 57.

The spelling of 28165525869 in words is "twenty-eight billion, one hundred sixty-five million, five hundred twenty-five thousand, eight hundred sixty-nine".