28128731457 has 8 divisors (see below), whose sum is σ = 37956842784. Its totient is φ = 18526553888.

The previous prime is 28128731441. The next prime is 28128731467. The reversal of 28128731457 is 75413782182.

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 28128731457 - 2⁴ = 28128731441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28128731417) 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, 56483148 + ... + 56483645.

It is an arithmetic number, because the mean of its divisors is an integer number (4744605348).

Almost surely, 2^28128731457 is an apocalyptic number.

It is an amenable number.

28128731457 is a deficient number, since it is larger than the sum of its proper divisors (9828111327).

28128731457 is a wasteful number, since it uses less digits than its factorization.

28128731457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112966879.

The product of its digits is 752640, while the sum is 48.

The spelling of 28128731457 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred thirty-one thousand, four hundred fifty-seven".