3865770780 has 96 divisors (see below), whose sum is σ = 11483996160. Its totient is φ = 968889600.

The previous prime is 3865770749. The next prime is 3865770809. The reversal of 3865770780 is 870775683.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131430 + ... + 158130.

It is an arithmetic number, because the mean of its divisors is an integer number (119624960).

Almost surely, 2^3865770780 is an apocalyptic number.

3865770780 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 3865770780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5741998080).

3865770780 is an abundant number, since it is smaller than the sum of its proper divisors (7618225380).

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

3865770780 is a wasteful number, since it uses less digits than its factorization.

3865770780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26859 (or 26857 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 51.

The square root of 3865770780 is about 62175.3229183412. The cubic root of 3865770780 is about 1569.4423459325.

The spelling of 3865770780 in words is "three billion, eight hundred sixty-five million, seven hundred seventy thousand, seven hundred eighty".