28074247081 has 4 divisors (see below), whose sum is σ = 28727136592. Its totient is φ = 27421357572.

The previous prime is 28074247073. The next prime is 28074247147. The reversal of 28074247081 is 18074247082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28074247081 - 2³ = 28074247073 is a prime.

It is a super-2 number, since 2×28074247081² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 652889467 = 28074247081 / (2 + 8 + 0 + 7 + 4 + 2 + 4 + 7 + 0 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (28074247681) 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, 326444691 + ... + 326444776.

It is an arithmetic number, because the mean of its divisors is an integer number (7181784148).

Almost surely, 2^28074247081 is an apocalyptic number.

It is an amenable number.

28074247081 is a deficient number, since it is larger than the sum of its proper divisors (652889511).

28074247081 is an equidigital number, since it uses as much as digits as its factorization.

28074247081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652889510.

The product of its (nonzero) digits is 200704, while the sum is 43.

Subtracting from 28074247081 its reverse (18074247082), we obtain a palindrome (9999999999).

The spelling of 28074247081 in words is "twenty-eight billion, seventy-four million, two hundred forty-seven thousand, eighty-one".