3640291681 has 16 divisors (see below), whose sum is σ = 4196606400. Its totient is φ = 3129444288.

The previous prime is 3640291679. The next prime is 3640291687. The reversal of 3640291681 is 1861920463.

It is a cyclic number.

It is not a de Polignac number, because 3640291681 - 2¹ = 3640291679 is a prime.

It is a super-2 number, since 2×3640291681² = 26503447045515611522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3640291687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110326 + ... + 139471.

It is an arithmetic number, because the mean of its divisors is an integer number (262287900).

Almost surely, 2^3640291681 is an apocalyptic number.

It is an amenable number.

3640291681 is a deficient number, since it is larger than the sum of its proper divisors (556314719).

3640291681 is a wasteful number, since it uses less digits than its factorization.

3640291681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249888.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 3640291681 is about 60334.8297503192. The cubic root of 3640291681 is about 1538.3154235051.

The spelling of 3640291681 in words is "three billion, six hundred forty million, two hundred ninety-one thousand, six hundred eighty-one".