28181234659 has 4 divisors (see below), whose sum is σ = 28183835016. Its totient is φ = 28178634304.

The previous prime is 28181234651. The next prime is 28181234717. The reversal of 28181234659 is 95643218182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28181234659 - 2³ = 28181234651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28181234651) 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, 1283854 + ... + 1305619.

It is an arithmetic number, because the mean of its divisors is an integer number (7045958754).

Almost surely, 2^28181234659 is an apocalyptic number.

28181234659 is a deficient number, since it is larger than the sum of its proper divisors (2600357).

28181234659 is a wasteful number, since it uses less digits than its factorization.

28181234659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600356.

The product of its digits is 829440, while the sum is 49.

The spelling of 28181234659 in words is "twenty-eight billion, one hundred eighty-one million, two hundred thirty-four thousand, six hundred fifty-nine".