28182687129 has 45 divisors (see below), whose sum is σ = 44064418629. Its totient is φ = 17949408840.

The previous prime is 28182687119. The next prime is 28182687131. The reversal of 28182687129 is 92178628182.

The square root of 28182687129 is 167877.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 28182687129 - 2²¹ = 28180589977 is a prime.

It is a super-2 number, since 2×28182687129² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28182687119) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 34750134 + ... + 34750944.

Almost surely, 2^28182687129 is an apocalyptic number.

28182687129 is the 167877-th square number.

28182687129 is the 83939-th centered octagonal number.

It is an amenable number.

28182687129 is a deficient number, since it is larger than the sum of its proper divisors (15881731500).

28182687129 is an frugal number, since it uses more digits than its factorization.

28182687129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680 (or 837 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The spelling of 28182687129 in words is "twenty-eight billion, one hundred eighty-two million, six hundred eighty-seven thousand, one hundred twenty-nine".