3781381536 has 96 divisors (see below), whose sum is σ = 11677841280. Its totient is φ = 1186311168.

The previous prime is 3781381523. The next prime is 3781381547. The reversal of 3781381536 is 6351831873.

3781381536 is a `hidden beast` number, since 3 + 7 + 81 + 38 + 1 + 536 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 3781381491 and 3781381500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114036 + ... + 143411.

It is an arithmetic number, because the mean of its divisors is an integer number (121644180).

Almost surely, 2^3781381536 is an apocalyptic number.

3781381536 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3781381536 is an abundant number, since it is smaller than the sum of its proper divisors (7896459744).

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

3781381536 is a wasteful number, since it uses less digits than its factorization.

3781381536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257483 (or 257469 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 3781381536 is about 61492.9389117157. The cubic root of 3781381536 is about 1557.9379856812.

The spelling of 3781381536 in words is "three billion, seven hundred eighty-one million, three hundred eighty-one thousand, five hundred thirty-six".