3621863538 has 16 divisors (see below), whose sum is σ = 8048585760. Its totient is φ = 1207287828.

The previous prime is 3621863533. The next prime is 3621863551. The reversal of 3621863538 is 8353681263.

3621863538 is a `hidden beast` number, since 3 + 6 + 2 + 1 + 8 + 635 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 3621863493 and 3621863502.

It is not an unprimeable number, because it can be changed into a prime (3621863533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33535720 + ... + 33535827.

It is an arithmetic number, because the mean of its divisors is an integer number (503036610).

Almost surely, 2^3621863538 is an apocalyptic number.

3621863538 is an abundant number, since it is smaller than the sum of its proper divisors (4426722222).

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

3621863538 is a wasteful number, since it uses less digits than its factorization.

3621863538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67071558 (or 67071552 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 3621863538 is about 60181.9203581940. The cubic root of 3621863538 is about 1535.7152410961.

The spelling of 3621863538 in words is "three billion, six hundred twenty-one million, eight hundred sixty-three thousand, five hundred thirty-eight".