64660560 has 40 divisors (see below), whose sum is σ = 200448480. Its totient is φ = 17242752.

The previous prime is 64660559. The next prime is 64660577. The reversal of 64660560 is 6506646.

It is a tau number, because it is divible by the number of its divisors (40).

It is a zygodrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134470 + ... + 134949.

It is an arithmetic number, because the mean of its divisors is an integer number (5011212).

Almost surely, 2^64660560 is an apocalyptic number.

64660560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64660560 is an abundant number, since it is smaller than the sum of its proper divisors (135787920).

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

64660560 is a wasteful number, since it uses less digits than its factorization.

64660560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269435 (or 269429 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 64660560 is about 8041.1790180296. The cubic root of 64660560 is about 401.3714590428.

The spelling of 64660560 in words is "sixty-four million, six hundred sixty thousand, five hundred sixty".