64917863 has 8 divisors (see below), whose sum is σ = 67787280. Its totient is φ = 62090560.

The previous prime is 64917821. The next prime is 64917871. The reversal of 64917863 is 36871946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64917863 - 2¹² = 64913767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64917803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7358 + ... + 13563.

It is an arithmetic number, because the mean of its divisors is an integer number (8473410).

Almost surely, 2^64917863 is an apocalyptic number.

64917863 is a deficient number, since it is larger than the sum of its proper divisors (2869417).

64917863 is a wasteful number, since it uses less digits than its factorization.

64917863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21057.

The product of its digits is 217728, while the sum is 44.

The square root of 64917863 is about 8057.1622175553. The cubic root of 64917863 is about 401.9031453174.

The spelling of 64917863 in words is "sixty-four million, nine hundred seventeen thousand, eight hundred sixty-three".