28687018693 has 4 divisors (see below), whose sum is σ = 28709036128. Its totient is φ = 28665001260.

The previous prime is 28687018687. The next prime is 28687018733. The reversal of 28687018693 is 39681078682.

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 28687018693 - 2²¹ = 28684921541 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 (28687018643) 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, 11006763 + ... + 11009368.

It is an arithmetic number, because the mean of its divisors is an integer number (7177259032).

Almost surely, 2^28687018693 is an apocalyptic number.

It is an amenable number.

28687018693 is a deficient number, since it is larger than the sum of its proper divisors (22017435).

28687018693 is a wasteful number, since it uses less digits than its factorization.

28687018693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22017434.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The spelling of 28687018693 in words is "twenty-eight billion, six hundred eighty-seven million, eighteen thousand, six hundred ninety-three".