28147225391 has 8 divisors (see below), whose sum is σ = 29794979280. Its totient is φ = 26544615552.

The previous prime is 28147225373. The next prime is 28147225409. The reversal of 28147225391 is 19352274182.

It is an interprime number because it is at equal distance from previous prime (28147225373) and next prime (28147225409).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28147225391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28147225291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11284730 + ... + 11287223.

It is an arithmetic number, because the mean of its divisors is an integer number (3724372410).

Almost surely, 2^28147225391 is an apocalyptic number.

28147225391 is a deficient number, since it is larger than the sum of its proper divisors (1647753889).

28147225391 is a wasteful number, since it uses less digits than its factorization.

28147225391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22572025.

The product of its digits is 241920, while the sum is 44.

The spelling of 28147225391 in words is "twenty-eight billion, one hundred forty-seven million, two hundred twenty-five thousand, three hundred ninety-one".