64217916 has 36 divisors (see below), whose sum is σ = 185519152. Its totient is φ = 18347904.

The previous prime is 64217911. The next prime is 64217917. The reversal of 64217916 is 61971246.

64217916 is a `hidden beast` number, since 642 + 1 + 7 + 9 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64217911) 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, 127165 + ... + 127668.

Almost surely, 2^64217916 is an apocalyptic number.

It is an amenable number.

64217916 is an abundant number, since it is smaller than the sum of its proper divisors (121301236).

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

64217916 is a wasteful number, since it uses less digits than its factorization.

64217916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254850 (or 254845 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 64217916 is about 8013.6081760965. The cubic root of 64217916 is about 400.4534773681.

The spelling of 64217916 in words is "sixty-four million, two hundred seventeen thousand, nine hundred sixteen".