3615681 has 16 divisors (see below), whose sum is σ = 5115200. Its totient is φ = 2265408.

The previous prime is 3615671. The next prime is 3615701. The reversal of 3615681 is 1865163.

It is not a de Polignac number, because 3615681 - 2⁵ = 3615649 is a prime.

It is a super-2 number, since 2×3615681² = 26146298187522, which contains 22 as substring.

It is a Duffinian number.

3615681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3615641) 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, 12915 + ... + 13191.

It is an arithmetic number, because the mean of its divisors is an integer number (319700).

Almost surely, 2^3615681 is an apocalyptic number.

It is an amenable number.

3615681 is a deficient number, since it is larger than the sum of its proper divisors (1499519).

3615681 is a wasteful number, since it uses less digits than its factorization.

3615681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its digits is 4320, while the sum is 30.

The square root of 3615681 is about 1901.4944122979. The cubic root of 3615681 is about 153.4840919050.

The spelling of 3615681 in words is "three million, six hundred fifteen thousand, six hundred eighty-one".