3640655 has 4 divisors (see below), whose sum is σ = 4368792. Its totient is φ = 2912520.

The previous prime is 3640649. The next prime is 3640661. The reversal of 3640655 is 5560463.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3640649) and next prime (3640661).

It is not a de Polignac number, because 3640655 - 2⁶ = 3640591 is a prime.

It is a d-powerful number, because it can be written as 3² + 6⁵ + 4 + 0 + 6⁸ + 5³ + 5⁹ .

It is a Duffinian number.

It is a plaindrome in base 14.

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, 364061 + ... + 364070.

It is an arithmetic number, because the mean of its divisors is an integer number (1092198).

Almost surely, 2^3640655 is an apocalyptic number.

3640655 is a deficient number, since it is larger than the sum of its proper divisors (728137).

3640655 is an equidigital number, since it uses as much as digits as its factorization.

3640655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728136.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 3640655 is about 1908.0500517544. The cubic root of 3640655 is about 153.8366598949.

The spelling of 3640655 in words is "three million, six hundred forty thousand, six hundred fifty-five".