4491867564 has 36 divisors (see below), whose sum is σ = 11356805824. Its totient is φ = 1496977632.

The previous prime is 4491867563. The next prime is 4491867571. The reversal of 4491867564 is 4657681944.

4491867564 is a `hidden beast` number, since 4 + 4 + 9 + 18 + 67 + 564 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 4491867564.

It is not an unprimeable number, because it can be changed into a prime (4491867563) 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, 219414 + ... + 239010.

Almost surely, 2^4491867564 is an apocalyptic number.

It is an amenable number.

4491867564 is an abundant number, since it is smaller than the sum of its proper divisors (6864938260).

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

4491867564 is a wasteful number, since it uses less digits than its factorization.

4491867564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25974 (or 25969 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 4491867564 is about 67021.3963149083. The cubic root of 4491867564 is about 1649.9684798386.

The spelling of 4491867564 in words is "four billion, four hundred ninety-one million, eight hundred sixty-seven thousand, five hundred sixty-four".