64866816 has 120 divisors (see below), whose sum is σ = 214060704. Its totient is φ = 18524160.

The previous prime is 64866811. The next prime is 64866827. The reversal of 64866816 is 61866846.

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (64866811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31251 + ... + 33261.

Almost surely, 2^64866816 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 64866816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107030352).

64866816 is an abundant number, since it is smaller than the sum of its proper divisors (149193888).

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

64866816 is a wasteful number, since it uses less digits than its factorization.

64866816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042 (or 2023 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 64866816 is about 8053.9937919023. The cubic root of 64866816 is about 401.7977745781.

The spelling of 64866816 in words is "sixty-four million, eight hundred sixty-six thousand, eight hundred sixteen".