28365285372649 has 3 divisors (see below), whose sum is σ = 28365290698557. Its totient is φ = 28365280046742.

The previous prime is 28365285372637. The next prime is 28365285372737. The reversal of 28365285372649 is 94627358256382.

The square root of 28365285372649 is 5325907.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-28365285372649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28365285372049) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2662954 + ... + 7988860.

It is an arithmetic number, because the mean of its divisors is an integer number (9455096899519).

Almost surely, 2^{28365285372649} is an apocalyptic number.

28365285372649 is the 5325907-th square number.

28365285372649 is the 2662954-th centered octagonal number.

It is an amenable number.

28365285372649 is a deficient number, since it is larger than the sum of its proper divisors (5325908).

28365285372649 is an frugal number, since it uses more digits than its factorization.

28365285372649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10651814 (or 5325907 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 70.

The spelling of 28365285372649 in words is "twenty-eight trillion, three hundred sixty-five billion, two hundred eighty-five million, three hundred seventy-two thousand, six hundred forty-nine".