3656631687 has 8 divisors (see below), whose sum is σ = 4877629680. Its totient is φ = 2436694080.

The previous prime is 3656631679. The next prime is 3656631697. The reversal of 3656631687 is 7861366563.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3656631687 - 2³ = 3656631679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656631607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257014 + ... + 270867.

It is an arithmetic number, because the mean of its divisors is an integer number (609703710).

Almost surely, 2^3656631687 is an apocalyptic number.

3656631687 is a deficient number, since it is larger than the sum of its proper divisors (1220997993).

3656631687 is a wasteful number, since it uses less digits than its factorization.

3656631687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530193.

The product of its digits is 3265920, while the sum is 51.

The square root of 3656631687 is about 60470.0891929225. The cubic root of 3656631687 is about 1540.6136429797.

The spelling of 3656631687 in words is "three billion, six hundred fifty-six million, six hundred thirty-one thousand, six hundred eighty-seven".