65565220 has 24 divisors (see below), whose sum is σ = 157356864. Its totient is φ = 22479456.

The previous prime is 65565211. The next prime is 65565223. The reversal of 65565220 is 2256556.

It is not an unprimeable number, because it can be changed into a prime (65565223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234022 + ... + 234301.

It is an arithmetic number, because the mean of its divisors is an integer number (6556536).

Almost surely, 2^65565220 is an apocalyptic number.

It is an amenable number.

65565220 is an abundant number, since it is smaller than the sum of its proper divisors (91791644).

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

65565220 is a wasteful number, since it uses less digits than its factorization.

65565220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468339 (or 468337 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 65565220 is about 8097.2353306545. The cubic root of 65565220 is about 403.2346471366.

The spelling of 65565220 in words is "sixty-five million, five hundred sixty-five thousand, two hundred twenty".