3644450040 has 256 divisors, whose sum is σ = 14349312000. Its totient is φ = 717396480.

The previous prime is 3644450011. The next prime is 3644450057. The reversal of 3644450040 is 400544463.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165181 + ... + 185939.

It is an arithmetic number, because the mean of its divisors is an integer number (56052000).

Almost surely, 2^3644450040 is an apocalyptic number.

3644450040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3644450040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7174656000).

3644450040 is an abundant number, since it is smaller than the sum of its proper divisors (10704861960).

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

3644450040 is a wasteful number, since it uses less digits than its factorization.

3644450040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20810 (or 20806 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 3644450040 is about 60369.2805986621. The cubic root of 3644450040 is about 1538.9009474269.

The spelling of 3644450040 in words is "three billion, six hundred forty-four million, four hundred fifty thousand, forty".