3621780906 has 32 divisors (see below), whose sum is σ = 7282312128. Its totient is φ = 1200816000.

The previous prime is 3621780889. The next prime is 3621780907. The reversal of 3621780906 is 6090871263.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3621780907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1681126 + ... + 1683278.

It is an arithmetic number, because the mean of its divisors is an integer number (227572254).

Almost surely, 2^3621780906 is an apocalyptic number.

3621780906 is an abundant number, since it is smaller than the sum of its proper divisors (3660531222).

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

3621780906 is a wasteful number, since it uses less digits than its factorization.

3621780906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 3621780906 is about 60181.2338358063. The cubic root of 3621780906 is about 1535.7035620083.

The spelling of 3621780906 in words is "three billion, six hundred twenty-one million, seven hundred eighty thousand, nine hundred six".