3885661644 has 144 divisors (see below), whose sum is σ = 10166661120. Its totient is φ = 1153105920.

The previous prime is 3885661639. The next prime is 3885661667. The reversal of 3885661644 is 4461665883.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5052492 + ... + 5053260.

Almost surely, 2^3885661644 is an apocalyptic number.

3885661644 is a gapful number since it is divisible by the number (34) 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 3885661644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5083330560).

3885661644 is an abundant number, since it is smaller than the sum of its proper divisors (6280999476).

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

3885661644 is a wasteful number, since it uses less digits than its factorization.

3885661644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 869 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 51.

The square root of 3885661644 is about 62335.0755514101. The cubic root of 3885661644 is about 1572.1295353248.

The spelling of 3885661644 in words is "three billion, eight hundred eighty-five million, six hundred sixty-one thousand, six hundred forty-four".