28176332129 has 12 divisors (see below), whose sum is σ = 30983299620. Its totient is φ = 25604409600.

The previous prime is 28176332099. The next prime is 28176332153. The reversal of 28176332129 is 92123367182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5647823104 + 22528509025 = 75152^2 + 150095^2 .

It is not a de Polignac number, because 28176332129 - 2¹⁶ = 28176266593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28176332129.

It is not an unprimeable number, because it can be changed into a prime (28176332159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258857 + ... + 351225.

It is an arithmetic number, because the mean of its divisors is an integer number (2581941635).

Almost surely, 2^28176332129 is an apocalyptic number.

It is an amenable number.

28176332129 is a deficient number, since it is larger than the sum of its proper divisors (2806967491).

28176332129 is a wasteful number, since it uses less digits than its factorization.

28176332129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94912 (or 94901 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The spelling of 28176332129 in words is "twenty-eight billion, one hundred seventy-six million, three hundred thirty-two thousand, one hundred twenty-nine".