3861565290 has 96 divisors (see below), whose sum is σ = 10968452352. Its totient is φ = 934800000.

The previous prime is 3861565271. The next prime is 3861565291. The reversal of 3861565290 is 925651683.

3861565290 is a `hidden beast` number, since 3 + 8 + 61 + 565 + 29 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (3861565291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 810415 + ... + 815165.

It is an arithmetic number, because the mean of its divisors is an integer number (114254712).

Almost surely, 2^3861565290 is an apocalyptic number.

3861565290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3861565290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5484226176).

3861565290 is an abundant number, since it is smaller than the sum of its proper divisors (7106887062).

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

3861565290 is a wasteful number, since it uses less digits than its factorization.

3861565290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5596 (or 5593 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 3861565290 is about 62141.4941082044. The cubic root of 3861565290 is about 1568.8730184212.

The spelling of 3861565290 in words is "three billion, eight hundred sixty-one million, five hundred sixty-five thousand, two hundred ninety".