28052006137 has 4 divisors (see below), whose sum is σ = 28052348020. Its totient is φ = 28051664256.

The previous prime is 28052006131. The next prime is 28052006141. The reversal of 28052006137 is 73160025082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 73160025082 = 2 ⋅36580012541.

It can be written as a sum of positive squares in 2 ways, for example, as 2137767696 + 25914238441 = 46236^2 + 160979^2 .

It is a 3-Lehmer number, since φ(28052006137) divides (28052006137-1)³.

It is a cyclic number.

It is not a de Polignac number, because 28052006137 - 2⁷ = 28052006009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28052006131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34189 + ... + 239317.

It is an arithmetic number, because the mean of its divisors is an integer number (7013087005).

It is a Poulet number, since it divides 2^28052006136-1.

Almost surely, 2^28052006137 is an apocalyptic number.

28052006137 is the 136753-rd pentagonal number.

It is an amenable number.

28052006137 is a deficient number, since it is larger than the sum of its proper divisors (341883).

28052006137 is a wasteful number, since it uses less digits than its factorization.

28052006137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341882.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 28052006137 in words is "twenty-eight billion, fifty-two million, six thousand, one hundred thirty-seven".