64866917 has 12 divisors (see below), whose sum is σ = 69203940. Its totient is φ = 60788736.

The previous prime is 64866913. The next prime is 64866937. The reversal of 64866917 is 71966846.

It is a happy number.

It is a Cunningham number, because it is equal to 8054²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 15319396 + 49547521 = 3914^2 + 7039^2 .

It is not a de Polignac number, because 64866917 - 2² = 64866913 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64866913) 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, 112133 + ... + 112709.

It is an arithmetic number, because the mean of its divisors is an integer number (5766995).

Almost surely, 2^64866917 is an apocalyptic number.

It is an amenable number.

64866917 is a deficient number, since it is larger than the sum of its proper divisors (4337023).

64866917 is a wasteful number, since it uses less digits than its factorization.

64866917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000 (or 983 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 64866917 is about 8054.0000620810. Note that the first 4 decimals coincide. The cubic root of 64866917 is about 401.7979831159.

The spelling of 64866917 in words is "sixty-four million, eight hundred sixty-six thousand, nine hundred seventeen".