8564728428 has 36 divisors (see below), whose sum is σ = 22451574600. Its totient is φ = 2854909152.

The previous prime is 8564728423. The next prime is 8564728429. The reversal of 8564728428 is 8248274658.

8564728428 is a `hidden beast` number, since 8 + 564 + 72 + 8 + 4 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (8564728423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4404753 + ... + 4406696.

It is an arithmetic number, because the mean of its divisors is an integer number (623654850).

Almost surely, 2^8564728428 is an apocalyptic number.

It is an amenable number.

8564728428 is an abundant number, since it is smaller than the sum of its proper divisors (13886846172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8564728428 is a wasteful number, since it uses less digits than its factorization.

8564728428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8811468 (or 8811454 counting only the distinct ones).

The product of its digits is 6881280, while the sum is 54.

The square root of 8564728428 is about 92545.8179930352. The cubic root of 8564728428 is about 2045.9948314727.

It can be divided in two parts, 856472 and 8428, that added together give a square (864900 = 930²).

The spelling of 8564728428 in words is "eight billion, five hundred sixty-four million, seven hundred twenty-eight thousand, four hundred twenty-eight".