28264360644 has 60 divisors (see below), whose sum is σ = 79572373804. Its totient is φ = 8696725056.

The previous prime is 28264360627. The next prime is 28264360673. The reversal of 28264360644 is 44606346282.

28264360644 is a `hidden beast` number, since 28 + 264 + 360 + 6 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4161798144 + 24102562500 = 64512^2 + 155250^2 .

It is a super-2 number, since 2×28264360644² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28264360644.

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 19 ways as a sum of consecutive naturals, for example, 3351007 + ... + 3359430.

Almost surely, 2^28264360644 is an apocalyptic number.

It is an amenable number.

28264360644 is an abundant number, since it is smaller than the sum of its proper divisors (51308013160).

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

28264360644 is a wasteful number, since it uses less digits than its factorization.

28264360644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6710466 (or 6710455 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 45.

The spelling of 28264360644 in words is "twenty-eight billion, two hundred sixty-four million, three hundred sixty thousand, six hundred forty-four".