28783188131 has 4 divisors (see below), whose sum is σ = 28784104200. Its totient is φ = 28782272064.

The previous prime is 28783188107. The next prime is 28783188157. The reversal of 28783188131 is 13188138782.

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 28783188131 - 2⁶ = 28783188067 is a prime.

It is a super-2 number, since 2×28783188131² (a number of 22 digits) contains 22 as substring.

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 28783188131.

It is not an unprimeable number, because it can be changed into a prime (28783188101) 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, 409166 + ... + 474323.

It is an arithmetic number, because the mean of its divisors is an integer number (7196026050).

Almost surely, 2^28783188131 is an apocalyptic number.

28783188131 is a deficient number, since it is larger than the sum of its proper divisors (916069).

28783188131 is an equidigital number, since it uses as much as digits as its factorization.

28783188131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916068.

The product of its digits is 516096, while the sum is 50.

The spelling of 28783188131 in words is "twenty-eight billion, seven hundred eighty-three million, one hundred eighty-eight thousand, one hundred thirty-one".