64706688 has 120 divisors (see below), whose sum is σ = 195034455. Its totient is φ = 21295872.

The previous prime is 64706687. The next prime is 64706699. The reversal of 64706688 is 88660746.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 32353344 + 32353344 = 5688^2 + 5688^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5688.

It is not an unprimeable number, because it can be changed into a prime (64706687) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 819033 + ... + 819111.

Almost surely, 2^64706688 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 64706688

64706688 is an abundant number, since it is smaller than the sum of its proper divisors (130327767).

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

64706688 is an frugal number, since it uses more digits than its factorization.

64706688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 64706688 is about 8044.0467427782. The cubic root of 64706688 is about 401.4668807432.

The spelling of 64706688 in words is "sixty-four million, seven hundred six thousand, six hundred eighty-eight".