64667712 has 56 divisors (see below), whose sum is σ = 175743616. Its totient is φ = 20971008.

The previous prime is 64667693. The next prime is 64667719. The reversal of 64667712 is 21776646.

It is not an unprimeable number, because it can be changed into a prime (64667719) 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, 2553 + ... + 11655.

Almost surely, 2^64667712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64667712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87871808).

64667712 is an abundant number, since it is smaller than the sum of its proper divisors (111075904).

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

64667712 is a wasteful number, since it uses less digits than its factorization.

64667712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9155 (or 9145 counting only the distinct ones).

The product of its digits is 84672, while the sum is 39.

The square root of 64667712 is about 8041.6237166383. The cubic root of 64667712 is about 401.3862568466.

The spelling of 64667712 in words is "sixty-four million, six hundred sixty-seven thousand, seven hundred twelve".