3640884666 has 8 divisors (see below), whose sum is σ = 7281769344. Its totient is φ = 1213628220.

The previous prime is 3640884629. The next prime is 3640884677. The reversal of 3640884666 is 6664880463.

It is a happy number.

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

3640884666 is an admirable number.

It is a super-2 number, since 2×3640884666² = 26512082302227863112, which contains 22 as substring.

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, 303407050 + ... + 303407061.

It is an arithmetic number, because the mean of its divisors is an integer number (910221168).

Almost surely, 2^3640884666 is an apocalyptic number.

3640884666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3640884666 is a wasteful number, since it uses less digits than its factorization.

3640884666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606814116.

The product of its (nonzero) digits is 3981312, while the sum is 51.

The square root of 3640884666 is about 60339.7436686634. The cubic root of 3640884666 is about 1538.3989468896.

The spelling of 3640884666 in words is "three billion, six hundred forty million, eight hundred eighty-four thousand, six hundred sixty-six".