64866856 has 8 divisors (see below), whose sum is σ = 121625370. Its totient is φ = 32433424.

The previous prime is 64866829. The next prime is 64866871. The reversal of 64866856 is 65866846.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 61873956 + 2992900 = 7866^2 + 1730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4054171 + ... + 4054186.

Almost surely, 2^64866856 is an apocalyptic number.

It is an amenable number.

64866856 is a deficient number, since it is larger than the sum of its proper divisors (56758514).

64866856 is a wasteful number, since it uses less digits than its factorization.

64866856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8108363 (or 8108359 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The square root of 64866856 is about 8053.9962751419. The cubic root of 64866856 is about 401.7978571674.

The spelling of 64866856 in words is "sixty-four million, eight hundred sixty-six thousand, eight hundred fifty-six".