3870778640 has 20 divisors (see below), whose sum is σ = 8999560524. Its totient is φ = 1548311424.

The previous prime is 3870778633. The next prime is 3870778649. The reversal of 3870778640 is 468770783.

3870778640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2521244944 + 1349533696 = 50212^2 + 36736^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (3870778649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24192287 + ... + 24192446.

Almost surely, 2^3870778640 is an apocalyptic number.

It is an amenable number.

3870778640 is an abundant number, since it is smaller than the sum of its proper divisors (5128781884).

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

3870778640 is a wasteful number, since it uses less digits than its factorization.

3870778640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48384746 (or 48384740 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 50.

The square root of 3870778640 is about 62215.5819710786. The cubic root of 3870778640 is about 1570.1197577248.

The spelling of 3870778640 in words is "three billion, eight hundred seventy million, seven hundred seventy-eight thousand, six hundred forty".