28287166478 has 4 divisors (see below), whose sum is σ = 42430749720. Its totient is φ = 14143583238.

The previous prime is 28287166447. The next prime is 28287166487. The reversal of 28287166478 is 87466178282.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7071791618 + ... + 7071791621.

It is an arithmetic number, because the mean of its divisors is an integer number (10607687430).

Almost surely, 2^28287166478 is an apocalyptic number.

28287166478 is a deficient number, since it is larger than the sum of its proper divisors (14143583242).

28287166478 is a wasteful number, since it uses less digits than its factorization.

28287166478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14143583241.

The product of its digits is 14450688, while the sum is 59.

The spelling of 28287166478 in words is "twenty-eight billion, two hundred eighty-seven million, one hundred sixty-six thousand, four hundred seventy-eight".