3818416640 has 80 divisors (see below), whose sum is σ = 9250236072. Its totient is φ = 1511522304.

The previous prime is 3818416603. The next prime is 3818416649. The reversal of 3818416640 is 466148183.

It can be written as a sum of positive squares in 4 ways, for example, as 3776839936 + 41576704 = 61456^2 + 6448^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (3818416649) 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, 240632 + ... + 256008.

Almost surely, 2^3818416640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3818416640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4625118036).

3818416640 is an abundant number, since it is smaller than the sum of its proper divisors (5431819432).

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

3818416640 is an equidigital number, since it uses as much as digits as its factorization.

3818416640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15497 (or 15481 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 3818416640 is about 61793.3381522636. The cubic root of 3818416640 is about 1563.0076536277.

The spelling of 3818416640 in words is "three billion, eight hundred eighteen million, four hundred sixteen thousand, six hundred forty".