28642854564 has 81 divisors (see below), whose sum is σ = 73674536481. Its totient is φ = 9382776480.

The previous prime is 28642854553. The next prime is 28642854587. The reversal of 28642854564 is 46545824682.

The square root of 28642854564 is 169242.

It is a perfect power (a square), and thus also a powerful number.

28642854564 is a `hidden beast` number, since 2 + 8 + 6 + 4 + 28 + 54 + 564 = 666.

It can be written as a sum of positive squares in only one way, i.e., 135908964 + 28506945600 = 11658^2 + 168840^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28642854564.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 68035074 + ... + 68035494.

Almost surely, 2^28642854564 is an apocalyptic number.

28642854564 is the 169242-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28642854564

28642854564 is an abundant number, since it is smaller than the sum of its proper divisors (45031681917).

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

28642854564 is an equidigital number, since it uses as much as digits as its factorization.

28642854564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986 (or 493 counting only the distinct ones).

The product of its digits is 14745600, while the sum is 54.

The spelling of 28642854564 in words is "twenty-eight billion, six hundred forty-two million, eight hundred fifty-four thousand, five hundred sixty-four".