3638641356 has 36 divisors (see below), whose sum is σ = 10511631312. Its totient is φ = 1039611744.

The previous prime is 3638641351. The next prime is 3638641411. The reversal of 3638641356 is 6531468363.

3638641356 is a `hidden beast` number, since 3 + 638 + 6 + 4 + 1 + 3 + 5 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (3638641351) 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, 7219275 + ... + 7219778.

Almost surely, 2^3638641356 is an apocalyptic number.

3638641356 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3638641356 is an abundant number, since it is smaller than the sum of its proper divisors (6872989956).

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

3638641356 is a wasteful number, since it uses less digits than its factorization.

3638641356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14439070 (or 14439065 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 3638641356 is about 60321.1518126105. The cubic root of 3638641356 is about 1538.0829234416.

The spelling of 3638641356 in words is "three billion, six hundred thirty-eight million, six hundred forty-one thousand, three hundred fifty-six".