28728571587 has 8 divisors (see below), whose sum is σ = 38308094736. Its totient is φ = 19150714752.

The previous prime is 28728571559. The next prime is 28728571601. The reversal of 28728571587 is 78517582782.

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

It is not a de Polignac number, because 28728571587 - 2⁸ = 28728571331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28728571587.

It is not an unprimeable number, because it can be changed into a prime (28728571517) 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, 375778 + ... + 445719.

It is an arithmetic number, because the mean of its divisors is an integer number (4788511842).

Almost surely, 2^28728571587 is an apocalyptic number.

28728571587 is a deficient number, since it is larger than the sum of its proper divisors (9579523149).

28728571587 is a wasteful number, since it uses less digits than its factorization.

28728571587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833157.

The product of its digits is 17561600, while the sum is 60.

The spelling of 28728571587 in words is "twenty-eight billion, seven hundred twenty-eight million, five hundred seventy-one thousand, five hundred eighty-seven".