28081815743 has 4 divisors (see below), whose sum is σ = 28199313120. Its totient is φ = 27964318368.

The previous prime is 28081815739. The next prime is 28081815763. The reversal of 28081815743 is 34751818082.

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 28081815743 - 2² = 28081815739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081815763) 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, 58748330 + ... + 58748807.

It is an arithmetic number, because the mean of its divisors is an integer number (7049828280).

Almost surely, 2^28081815743 is an apocalyptic number.

28081815743 is a deficient number, since it is larger than the sum of its proper divisors (117497377).

28081815743 is a wasteful number, since it uses less digits than its factorization.

28081815743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117497376.

The product of its (nonzero) digits is 430080, while the sum is 47.

The spelling of 28081815743 in words is "twenty-eight billion, eighty-one million, eight hundred fifteen thousand, seven hundred forty-three".