65344664 has 128 divisors (see below), whose sum is σ = 162846720. Its totient is φ = 23846400.

The previous prime is 65344639. The next prime is 65344681. The reversal of 65344664 is 46644356.

It is a happy number.

It is a super-2 number, since 2×65344664² = 8539850226545792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1071194 + ... + 1071254.

It is an arithmetic number, because the mean of its divisors is an integer number (1272240).

Almost surely, 2^65344664 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 65344664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81423360).

65344664 is an abundant number, since it is smaller than the sum of its proper divisors (97502056).

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

65344664 is a wasteful number, since it uses less digits than its factorization.

65344664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 165 counting only the distinct ones).

The product of its digits is 207360, while the sum is 38.

The square root of 65344664 is about 8083.6046414950. The cubic root of 65344664 is about 402.7819898086.

The spelling of 65344664 in words is "sixty-five million, three hundred forty-four thousand, six hundred sixty-four".