28361821949 has 16 divisors (see below), whose sum is σ = 30214356480. Its totient is φ = 26546227200.

The previous prime is 28361821937. The next prime is 28361821967. The reversal of 28361821949 is 94912816382.

It is a cyclic number.

It is not a de Polignac number, because 28361821949 - 2⁸ = 28361821693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28361821949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28361821919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1079924 + ... + 1105874.

It is an arithmetic number, because the mean of its divisors is an integer number (1888397280).

Almost surely, 2^28361821949 is an apocalyptic number.

It is an amenable number.

28361821949 is a deficient number, since it is larger than the sum of its proper divisors (1852534531).

28361821949 is a wasteful number, since it uses less digits than its factorization.

28361821949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26660.

The product of its digits is 1492992, while the sum is 53.

The spelling of 28361821949 in words is "twenty-eight billion, three hundred sixty-one million, eight hundred twenty-one thousand, nine hundred forty-nine".