3640688 has 20 divisors (see below), whose sum is σ = 7108920. Its totient is φ = 1806144.

The previous prime is 3640661. The next prime is 3640697. The reversal of 3640688 is 8860463.

It is a super-2 number, since 2×3640688² = 26509218226688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1406 + ... + 3042.

It is an arithmetic number, because the mean of its divisors is an integer number (355446).

Almost surely, 2^3640688 is an apocalyptic number.

It is an amenable number.

3640688 is a deficient number, since it is larger than the sum of its proper divisors (3468232).

3640688 is a wasteful number, since it uses less digits than its factorization.

3640688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 3640688 is about 1908.0586993067. The cubic root of 3640688 is about 153.8371247009.

The spelling of 3640688 in words is "three million, six hundred forty thousand, six hundred eighty-eight".