64217812 has 6 divisors (see below), whose sum is σ = 112381178. Its totient is φ = 32108904.

The previous prime is 64217809. The next prime is 64217819. The reversal of 64217812 is 21871246.

It can be written as a sum of positive squares in only one way, i.e., 41139396 + 23078416 = 6414^2 + 4804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64217819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8027223 + ... + 8027230.

Almost surely, 2^64217812 is an apocalyptic number.

It is an amenable number.

64217812 is a deficient number, since it is larger than the sum of its proper divisors (48163366).

64217812 is a wasteful number, since it uses less digits than its factorization.

64217812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16054457 (or 16054455 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 64217812 is about 8013.6016871317. The cubic root of 64217812 is about 400.4532611917.

The spelling of 64217812 in words is "sixty-four million, two hundred seventeen thousand, eight hundred twelve".