28172078804 has 12 divisors (see below), whose sum is σ = 50350098624. Its totient is φ = 13786336344.

The previous prime is 28172078743. The next prime is 28172078833. The reversal of 28172078804 is 40887027182.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74925554 + ... + 74925929.

It is an arithmetic number, because the mean of its divisors is an integer number (4195841552).

Almost surely, 2^28172078804 is an apocalyptic number.

It is an amenable number.

28172078804 is a deficient number, since it is larger than the sum of its proper divisors (22178019820).

28172078804 is a wasteful number, since it uses less digits than its factorization.

28172078804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149851534 (or 149851532 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 47.

The spelling of 28172078804 in words is "twenty-eight billion, one hundred seventy-two million, seventy-eight thousand, eight hundred four".