3640563994 has 8 divisors (see below), whose sum is σ = 5461220160. Its totient is φ = 1820157276.

The previous prime is 3640563973. The next prime is 3640564001. The reversal of 3640563994 is 4993650463.

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

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, 20164 + ... + 87679.

It is an arithmetic number, because the mean of its divisors is an integer number (682652520).

Almost surely, 2^3640563994 is an apocalyptic number.

3640563994 is a deficient number, since it is larger than the sum of its proper divisors (1820656166).

3640563994 is a wasteful number, since it uses less digits than its factorization.

3640563994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124724.

The product of its (nonzero) digits is 2099520, while the sum is 49.

The square root of 3640563994 is about 60337.0863897156. The cubic root of 3640563994 is about 1538.3537805819.

The spelling of 3640563994 in words is "three billion, six hundred forty million, five hundred sixty-three thousand, nine hundred ninety-four".