3639428668 has 12 divisors (see below), whose sum is σ = 6517116760. Its totient is φ = 1777395312.

The previous prime is 3639428641. The next prime is 3639428687. The reversal of 3639428668 is 8668249363.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10579563 + ... + 10579906.

Almost surely, 2^3639428668 is an apocalyptic number.

3639428668 is the 32247-th centered heptagonal number.

It is an amenable number.

3639428668 is a deficient number, since it is larger than the sum of its proper divisors (2877688092).

3639428668 is a wasteful number, since it uses less digits than its factorization.

3639428668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21159516 (or 21159514 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 55.

The square root of 3639428668 is about 60327.6774623390. The cubic root of 3639428668 is about 1538.1938498099.

The spelling of 3639428668 in words is "three billion, six hundred thirty-nine million, four hundred twenty-eight thousand, six hundred sixty-eight".