64311660 has 144 divisors (see below), whose sum is σ = 228324096. Its totient is φ = 14345856.

The previous prime is 64311659. The next prime is 64311683. The reversal of 64311660 is 6611346.

64311660 is a `hidden beast` number, since 643 + 1 + 16 + 6 + 0 = 666.

It is a super-2 number, since 2×64311660² = 8271979223911200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53587 + ... + 54773.

It is an arithmetic number, because the mean of its divisors is an integer number (1585584).

Almost surely, 2^64311660 is an apocalyptic number.

64311660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64311660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114162048).

64311660 is an abundant number, since it is smaller than the sum of its proper divisors (164012436).

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

64311660 is a wasteful number, since it uses less digits than its factorization.

64311660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 64311660 is about 8019.4550937081. The cubic root of 64311660 is about 400.6482405596.

The spelling of 64311660 in words is "sixty-four million, three hundred eleven thousand, six hundred sixty".