64722663 has 6 divisors (see below), whose sum is σ = 93488304. Its totient is φ = 43148436.

The previous prime is 64722649. The next prime is 64722673. The reversal of 64722663 is 36622746.

It is a happy number.

64722663 is a `hidden beast` number, since 647 + 2 + 2 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 64722663 - 2⁵ = 64722631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64722673) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3595695 + ... + 3595712.

It is an arithmetic number, because the mean of its divisors is an integer number (15581384).

Almost surely, 2^64722663 is an apocalyptic number.

64722663 is a deficient number, since it is larger than the sum of its proper divisors (28765641).

64722663 is a wasteful number, since it uses less digits than its factorization.

64722663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7191413 (or 7191410 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 64722663 is about 8045.0396518600. The cubic root of 64722663 is about 401.4999165127.

The spelling of 64722663 in words is "sixty-four million, seven hundred twenty-two thousand, six hundred sixty-three".