28081814487 has 8 divisors (see below), whose sum is σ = 37443591936. Its totient is φ = 18720623352.

The previous prime is 28081814461. The next prime is 28081814491. The reversal of 28081814487 is 78441818082.

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

It is not a de Polignac number, because 28081814487 - 2¹⁴ = 28081798103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081814407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18943 + ... + 237744.

It is an arithmetic number, because the mean of its divisors is an integer number (4680448992).

Almost surely, 2^28081814487 is an apocalyptic number.

28081814487 is a deficient number, since it is larger than the sum of its proper divisors (9361777449).

28081814487 is a wasteful number, since it uses less digits than its factorization.

28081814487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293157.

The product of its (nonzero) digits is 917504, while the sum is 51.

The spelling of 28081814487 in words is "twenty-eight billion, eighty-one million, eight hundred fourteen thousand, four hundred eighty-seven".