65605660 has 48 divisors (see below), whose sum is σ = 145022976. Its totient is φ = 24881472.

The previous prime is 65605621. The next prime is 65605667. The reversal of 65605660 is 6650656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65605667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57859 + ... + 58981.

It is an arithmetic number, because the mean of its divisors is an integer number (3021312).

Almost surely, 2^65605660 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 65605660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72511488).

65605660 is an abundant number, since it is smaller than the sum of its proper divisors (79417316).

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

65605660 is a wasteful number, since it uses less digits than its factorization.

65605660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 65605660 is about 8099.7320943350. The cubic root of 65605660 is about 403.3175338543.

The spelling of 65605660 in words is "sixty-five million, six hundred five thousand, six hundred sixty".