64722647 has 8 divisors (see below), whose sum is σ = 71764752. Its totient is φ = 57873600.

The previous prime is 64722631. The next prime is 64722649. The reversal of 64722647 is 74622746.

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 64722647 - 2⁴ = 64722631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64722647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64722649) 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, 47558 + ... + 48899.

It is an arithmetic number, because the mean of its divisors is an integer number (8970594).

Almost surely, 2^64722647 is an apocalyptic number.

64722647 is a deficient number, since it is larger than the sum of its proper divisors (7042105).

64722647 is a wasteful number, since it uses less digits than its factorization.

64722647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96529.

The product of its digits is 112896, while the sum is 38.

The square root of 64722647 is about 8045.0386574584. The cubic root of 64722647 is about 401.4998834280.

Subtracting 64722647 from its reverse (74622746), we obtain a palindrome (9900099).

It can be divided in two parts, 6472 and 2647, that added together give a palindrome (9119).

The spelling of 64722647 in words is "sixty-four million, seven hundred twenty-two thousand, six hundred forty-seven".