64606656 has 56 divisors (see below), whose sum is σ = 172750480. Its totient is φ = 21307392.

The previous prime is 64606639. The next prime is 64606673. The reversal of 64606656 is 65660646.

64606656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64606639) and next prime (64606673).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16890 + ... + 20358.

It is an arithmetic number, because the mean of its divisors is an integer number (3084830).

Almost surely, 2^64606656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64606656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86375240).

64606656 is an abundant number, since it is smaller than the sum of its proper divisors (108143824).

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

64606656 is a wasteful number, since it uses less digits than its factorization.

64606656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581 (or 3571 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 64606656 is about 8037.8265719036. The cubic root of 64606656 is about 401.2598941670.

The spelling of 64606656 in words is "sixty-four million, six hundred six thousand, six hundred fifty-six".