3785641728 has 72 divisors (see below), whose sum is σ = 10991291136. Its totient is φ = 1147161600.

The previous prime is 3785641711. The next prime is 3785641729. The reversal of 3785641728 is 8271465873.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3785641729) 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, 215608 + ... + 232503.

Almost surely, 2^3785641728 is an apocalyptic number.

It is an amenable number.

3785641728 is an abundant number, since it is smaller than the sum of its proper divisors (7205649408).

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

3785641728 is a wasteful number, since it uses less digits than its factorization.

3785641728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448141 (or 448127 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The square root of 3785641728 is about 61527.5688451933. The cubic root of 3785641728 is about 1558.5228357710.

The spelling of 3785641728 in words is "three billion, seven hundred eighty-five million, six hundred forty-one thousand, seven hundred twenty-eight".