64691712 has 120 divisors (see below), whose sum is σ = 189909720. Its totient is φ = 21196800.

The previous prime is 64691707. The next prime is 64691717. The reversal of 64691712 is 21719646.

64691712 is a `hidden beast` number, since 646 + 9 + 1 + 7 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (64691707) and next prime (64691717).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64691717) 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, 465339 + ... + 465477.

It is an arithmetic number, because the mean of its divisors is an integer number (1582581).

Almost surely, 2^64691712 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 64691712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94954860).

64691712 is an abundant number, since it is smaller than the sum of its proper divisors (125218008).

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

64691712 is a wasteful number, since it uses less digits than its factorization.

64691712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 245 counting only the distinct ones).

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

The square root of 64691712 is about 8043.1158141606. The cubic root of 64691712 is about 401.4359059341.

The spelling of 64691712 in words is "sixty-four million, six hundred ninety-one thousand, seven hundred twelve".