28165144457 has 8 divisors (see below), whose sum is σ = 29302628352. Its totient is φ = 27041968800.

The previous prime is 28165144421. The next prime is 28165144507. The reversal of 28165144457 is 75444156182.

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

It is a cyclic number.

It is not a de Polignac number, because 28165144457 - 2⁶ = 28165144393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28165140457) 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, 3573044 + ... + 3580917.

It is an arithmetic number, because the mean of its divisors is an integer number (3662828544).

Almost surely, 2^28165144457 is an apocalyptic number.

It is an amenable number.

28165144457 is a deficient number, since it is larger than the sum of its proper divisors (1137483895).

28165144457 is a wasteful number, since it uses less digits than its factorization.

28165144457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7154119.

The product of its digits is 1075200, while the sum is 47.

The spelling of 28165144457 in words is "twenty-eight billion, one hundred sixty-five million, one hundred forty-four thousand, four hundred fifty-seven".