28189225961 has 8 divisors (see below), whose sum is σ = 30589367424. Its totient is φ = 25822190160.

The previous prime is 28189225931. The next prime is 28189225973. The reversal of 28189225961 is 16952298182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28189225961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28189225931) 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, 8274641 + ... + 8278046.

It is an arithmetic number, because the mean of its divisors is an integer number (3823670928).

Almost surely, 2^28189225961 is an apocalyptic number.

It is an amenable number.

28189225961 is a deficient number, since it is larger than the sum of its proper divisors (2400141463).

28189225961 is a wasteful number, since it uses less digits than its factorization.

28189225961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16552831.

The product of its digits is 1244160, while the sum is 53.

The spelling of 28189225961 in words is "twenty-eight billion, one hundred eighty-nine million, two hundred twenty-five thousand, nine hundred sixty-one".