28578539521 has 8 divisors (see below), whose sum is σ = 34380198080. Its totient is φ = 23206633488.

The previous prime is 28578539519. The next prime is 28578539579. The reversal of 28578539521 is 12593587582.

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 28578539521 - 2¹ = 28578539519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28578539021) 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, 107437986 + ... + 107438251.

It is an arithmetic number, because the mean of its divisors is an integer number (4297524760).

Almost surely, 2^28578539521 is an apocalyptic number.

It is an amenable number.

28578539521 is a deficient number, since it is larger than the sum of its proper divisors (5801658559).

28578539521 is a wasteful number, since it uses less digits than its factorization.

28578539521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214876263.

The product of its digits is 6048000, while the sum is 55.

The spelling of 28578539521 in words is "twenty-eight billion, five hundred seventy-eight million, five hundred thirty-nine thousand, five hundred twenty-one".