28285440666 has 16 divisors (see below), whose sum is σ = 64652435904. Its totient is φ = 8081554464.

The previous prime is 28285440593. The next prime is 28285440671. The reversal of 28285440666 is 66604458282.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336731395 + ... + 336731478.

It is an arithmetic number, because the mean of its divisors is an integer number (4040777244).

Almost surely, 2^28285440666 is an apocalyptic number.

28285440666 is an abundant number, since it is smaller than the sum of its proper divisors (36366995238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28285440666 is a wasteful number, since it uses less digits than its factorization.

28285440666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673462885.

The product of its (nonzero) digits is 4423680, while the sum is 51.

The spelling of 28285440666 in words is "twenty-eight billion, two hundred eighty-five million, four hundred forty thousand, six hundred sixty-six".