28445994428 has 48 divisors (see below), whose sum is σ = 52073570304. Its totient is φ = 13585316160.

The previous prime is 28445994403. The next prime is 28445994431. The reversal of 28445994428 is 82449954482.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1895651 + ... + 1910597.

It is an arithmetic number, because the mean of its divisors is an integer number (1084866048).

Almost surely, 2^28445994428 is an apocalyptic number.

It is an amenable number.

28445994428 is a deficient number, since it is larger than the sum of its proper divisors (23627575876).

28445994428 is a wasteful number, since it uses less digits than its factorization.

28445994428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15242 (or 15240 counting only the distinct ones).

The product of its digits is 26542080, while the sum is 59.

The spelling of 28445994428 in words is "twenty-eight billion, four hundred forty-five million, nine hundred ninety-four thousand, four hundred twenty-eight".