3681781015 has 16 divisors (see below), whose sum is σ = 4950053280. Its totient is φ = 2605288320.

The previous prime is 3681781013. The next prime is 3681781021. The reversal of 3681781015 is 5101871863.

It is not a de Polignac number, because 3681781015 - 2¹ = 3681781013 is a prime.

It is a super-2 number, since 2×3681781015² = 27111022884828860450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3681781013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 902580 + ... + 906649.

It is an arithmetic number, because the mean of its divisors is an integer number (309378330).

Almost surely, 2^3681781015 is an apocalyptic number.

3681781015 is a deficient number, since it is larger than the sum of its proper divisors (1268272265).

3681781015 is a wasteful number, since it uses less digits than its factorization.

3681781015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809282.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 3681781015 is about 60677.6813581402. The cubic root of 3681781015 is about 1544.1375517013.

The spelling of 3681781015 in words is "three billion, six hundred eighty-one million, seven hundred eighty-one thousand, fifteen".