28194889747 has 4 divisors (see below), whose sum is σ = 28195284880. Its totient is φ = 28194494616.

The previous prime is 28194889741. The next prime is 28194889753. The reversal of 28194889747 is 74798849182.

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

It is an interprime number because it is at equal distance from previous prime (28194889741) and next prime (28194889753).

It is a cyclic number.

It is not a de Polignac number, because 28194889747 - 2²³ = 28186501139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28194889741) 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, 57372 + ... + 244297.

It is an arithmetic number, because the mean of its divisors is an integer number (7048821220).

Almost surely, 2^28194889747 is an apocalyptic number.

28194889747 is a deficient number, since it is larger than the sum of its proper divisors (395133).

28194889747 is an equidigital number, since it uses as much as digits as its factorization.

28194889747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395132.

The product of its digits is 65028096, while the sum is 67.

The spelling of 28194889747 in words is "twenty-eight billion, one hundred ninety-four million, eight hundred eighty-nine thousand, seven hundred forty-seven".