64005660 has 48 divisors (see below), whose sum is σ = 199130400. Its totient is φ = 17068032.

The previous prime is 64005659. The next prime is 64005677. The reversal of 64005660 is 6650046.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58725 + ... + 59804.

It is an arithmetic number, because the mean of its divisors is an integer number (4148550).

Almost surely, 2^64005660 is an apocalyptic number.

64005660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64005660 is an abundant number, since it is smaller than the sum of its proper divisors (135124740).

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

64005660 is a wasteful number, since it uses less digits than its factorization.

64005660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118547 (or 118539 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 64005660 is about 8000.3537421792. The cubic root of 64005660 is about 400.0117913191.

The spelling of 64005660 in words is "sixty-four million, five thousand, six hundred sixty".