3644460378 has 80 divisors (see below), whose sum is σ = 9078322176. Its totient is φ = 1085179680.

The previous prime is 3644460371. The next prime is 3644460401. The reversal of 3644460378 is 8730644463.

3644460378 is a `hidden beast` number, since 36 + 4 + 4 + 4 + 603 + 7 + 8 = 666.

3644460378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3644460371) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 37375 + ... + 93197.

Almost surely, 2^3644460378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3644460378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4539161088).

3644460378 is an abundant number, since it is smaller than the sum of its proper divisors (5433861798).

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

3644460378 is a wasteful number, since it uses less digits than its factorization.

3644460378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55881 (or 55872 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 45.

The square root of 3644460378 is about 60369.3662216194. The cubic root of 3644460378 is about 1538.9024025292.

The spelling of 3644460378 in words is "three billion, six hundred forty-four million, four hundred sixty thousand, three hundred seventy-eight".