3556638540 has 216 divisors, whose sum is σ = 13515662160. Its totient is φ = 750387456.

The previous prime is 3556638529. The next prime is 3556638541. The reversal of 3556638540 is 458366553.

3556638540 is a `hidden beast` number, since 3 + 5 + 5 + 6 + 638 + 5 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (3556638541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 99151 + ... + 130169.

It is an arithmetic number, because the mean of its divisors is an integer number (62572510).

Almost surely, 2^3556638540 is an apocalyptic number.

3556638540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3556638540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6757831080).

3556638540 is an abundant number, since it is smaller than the sum of its proper divisors (9959023620).

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

3556638540 is a wasteful number, since it uses less digits than its factorization.

3556638540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31061 (or 31049 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The square root of 3556638540 is about 59637.5598092343. The cubic root of 3556638540 is about 1526.4406044718.

The spelling of 3556638540 in words is "three billion, five hundred fifty-six million, six hundred thirty-eight thousand, five hundred forty".