28368188642 has 8 divisors (see below), whose sum is σ = 42565979100. Its totient is φ = 14179528944.

The previous prime is 28368188623. The next prime is 28368188647. The reversal of 28368188642 is 24688186382.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24802785121 + 3565403521 = 157489^2 + 59711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28368188647) 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, 2274917 + ... + 2287352.

Almost surely, 2^28368188642 is an apocalyptic number.

28368188642 is a deficient number, since it is larger than the sum of its proper divisors (14197790458).

28368188642 is a wasteful number, since it uses less digits than its factorization.

28368188642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565380.

The product of its digits is 7077888, while the sum is 56.

The spelling of 28368188642 in words is "twenty-eight billion, three hundred sixty-eight million, one hundred eighty-eight thousand, six hundred forty-two".