64640606 has 16 divisors (see below), whose sum is σ = 98960400. Its totient is φ = 31660800.

The previous prime is 64640593. The next prime is 64640621. The reversal of 64640606 is 60604646.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17945 + ... + 21243.

It is an arithmetic number, because the mean of its divisors is an integer number (6185025).

Almost surely, 2^64640606 is an apocalyptic number.

64640606 is a deficient number, since it is larger than the sum of its proper divisors (34319794).

64640606 is a wasteful number, since it uses less digits than its factorization.

64640606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 64640606 is about 8039.9381838420. The cubic root of 64640606 is about 401.3301675658.

The spelling of 64640606 in words is "sixty-four million, six hundred forty thousand, six hundred six".