3621641858 has 48 divisors (see below), whose sum is σ = 5805694440. Its totient is φ = 1692149760.

The previous prime is 3621641857. The next prime is 3621641873. The reversal of 3621641858 is 8581461263.

It can be written as a sum of positive squares in 12 ways, for example, as 851929 + 3620789929 = 923^2 + 60173^2 .

It is not an unprimeable number, because it can be changed into a prime (3621641857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20934260 + ... + 20934432.

Almost surely, 2^3621641858 is an apocalyptic number.

3621641858 is a deficient number, since it is larger than the sum of its proper divisors (2184052582).

3621641858 is a wasteful number, since it uses less digits than its factorization.

3621641858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 362 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 3621641858 is about 60180.0785808726. The cubic root of 3621641858 is about 1535.6839087634.

The spelling of 3621641858 in words is "three billion, six hundred twenty-one million, six hundred forty-one thousand, eight hundred fifty-eight".