28020794566 has 4 divisors (see below), whose sum is σ = 42031191852. Its totient is φ = 14010397282.

The previous prime is 28020794551. The next prime is 28020794567. The reversal of 28020794566 is 66549702082.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28020794567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7005198640 + ... + 7005198643.

It is an arithmetic number, because the mean of its divisors is an integer number (10507797963).

Almost surely, 2^28020794566 is an apocalyptic number.

28020794566 is a deficient number, since it is larger than the sum of its proper divisors (14010397286).

28020794566 is a wasteful number, since it uses less digits than its factorization.

28020794566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14010397285.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 28020794566 in words is "twenty-eight billion, twenty million, seven hundred ninety-four thousand, five hundred sixty-six".