64320660 has 72 divisors (see below), whose sum is σ = 201417216. Its totient is φ = 16597440.

The previous prime is 64320653. The next prime is 64320667. The reversal of 64320660 is 6602346.

It is an interprime number because it is at equal distance from previous prime (64320653) and next prime (64320667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64320667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184 + ... + 11343.

Almost surely, 2^64320660 is an apocalyptic number.

64320660 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 64320660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100708608).

64320660 is an abundant number, since it is smaller than the sum of its proper divisors (137096556).

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

64320660 is a wasteful number, since it uses less digits than its factorization.

64320660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11573 (or 11568 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 64320660 is about 8020.0162094599. The cubic root of 64320660 is about 400.6669290627. Note that the first 3 decimals are identical.

It can be divided in two parts, 64320 and 660, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 64320660 in words is "sixty-four million, three hundred twenty thousand, six hundred sixty".