65205660 has 48 divisors (see below), whose sum is σ = 196622496. Its totient is φ = 16050432.

The previous prime is 65205641. The next prime is 65205661. The reversal of 65205660 is 6650256.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65205661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41019 + ... + 42578.

It is an arithmetic number, because the mean of its divisors is an integer number (4096302).

Almost surely, 2^65205660 is an apocalyptic number.

65205660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65205660 is an abundant number, since it is smaller than the sum of its proper divisors (131416836).

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

65205660 is a wasteful number, since it uses less digits than its factorization.

65205660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83622 (or 83620 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 65205660 is about 8075.0021671824. The cubic root of 65205660 is about 402.4961819526.

The spelling of 65205660 in words is "sixty-five million, two hundred five thousand, six hundred sixty".