64406656 has 64 divisors (see below), whose sum is σ = 137332800. Its totient is φ = 29998080.

The previous prime is 64406633. The next prime is 64406669. The reversal of 64406656 is 65660446.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172486 + ... + 172858.

It is an arithmetic number, because the mean of its divisors is an integer number (2145825).

Almost surely, 2^64406656 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 64406656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68666400).

64406656 is an abundant number, since it is smaller than the sum of its proper divisors (72926144).

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

64406656 is a wasteful number, since it uses less digits than its factorization.

64406656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 64406656 is about 8025.3757544429. The cubic root of 64406656 is about 400.8454119378.

The spelling of 64406656 in words is "sixty-four million, four hundred six thousand, six hundred fifty-six".