65640222 has 24 divisors (see below), whose sum is σ = 142497576. Its totient is φ = 21837456.

The previous prime is 65640187. The next prime is 65640233. The reversal of 65640222 is 22204656.

65640222 is a `hidden beast` number, since 656 + 4 + 0 + 2 + 2 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6753 + ... + 13299.

It is an arithmetic number, because the mean of its divisors is an integer number (5937399).

Almost surely, 2^65640222 is an apocalyptic number.

65640222 is an abundant number, since it is smaller than the sum of its proper divisors (76857354).

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

65640222 is a wasteful number, since it uses less digits than its factorization.

65640222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7112 (or 7109 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 65640222 is about 8101.8653407718. The cubic root of 65640222 is about 403.3883459026.

Adding to 65640222 its reverse (22204656), we get a palindrome (87844878).

The spelling of 65640222 in words is "sixty-five million, six hundred forty thousand, two hundred twenty-two".