28393817987 has 8 divisors (see below), whose sum is σ = 30162435600. Its totient is φ = 26652621024.

The previous prime is 28393817983. The next prime is 28393817999. The reversal of 28393817987 is 78971839382.

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

It is a cyclic number.

It is not a de Polignac number, because 28393817987 - 2² = 28393817983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28393817983) 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, 6853028 + ... + 6857169.

It is an arithmetic number, because the mean of its divisors is an integer number (3770304450).

Almost surely, 2^28393817987 is an apocalyptic number.

28393817987 is a deficient number, since it is larger than the sum of its proper divisors (1768617613).

28393817987 is a wasteful number, since it uses less digits than its factorization.

28393817987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13710325.

The product of its digits is 36578304, while the sum is 65.

The spelling of 28393817987 in words is "twenty-eight billion, three hundred ninety-three million, eight hundred seventeen thousand, nine hundred eighty-seven".