28225649236 has 24 divisors (see below), whose sum is σ = 52311752640. Its totient is φ = 13279792512.

The previous prime is 28225649233. The next prime is 28225649237. The reversal of 28225649236 is 63294652282.

It is a self number, because there is not a number n which added to its sum of digits gives 28225649236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28225649233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291075 + ... + 375733.

It is an arithmetic number, because the mean of its divisors is an integer number (2179656360).

Almost surely, 2^28225649236 is an apocalyptic number.

It is an amenable number.

28225649236 is a deficient number, since it is larger than the sum of its proper divisors (24086103404).

28225649236 is a wasteful number, since it uses less digits than its factorization.

28225649236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89583 (or 89581 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 49.

The spelling of 28225649236 in words is "twenty-eight billion, two hundred twenty-five million, six hundred forty-nine thousand, two hundred thirty-six".