3634021818 has 24 divisors (see below), whose sum is σ = 8998530528. Its totient is φ = 1038291912.

The previous prime is 3634021793. The next prime is 3634021819. The reversal of 3634021818 is 8181204363.

3634021818 is a `hidden beast` number, since 3 + 634 + 0 + 2 + 1 + 8 + 18 = 666.

It is a super-2 number, since 2×3634021818² = 26412229147400050248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3634021819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14420596 + ... + 14420847.

It is an arithmetic number, because the mean of its divisors is an integer number (374938772).

Almost surely, 2^3634021818 is an apocalyptic number.

3634021818 is an abundant number, since it is smaller than the sum of its proper divisors (5364508710).

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

3634021818 is a wasteful number, since it uses less digits than its factorization.

3634021818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28841458 (or 28841455 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 3634021818 is about 60282.8484562566. The cubic root of 3634021818 is about 1537.4317425180.

The spelling of 3634021818 in words is "three billion, six hundred thirty-four million, twenty-one thousand, eight hundred eighteen".