65640022 has 32 divisors (see below), whose sum is σ = 123609600. Its totient is φ = 25489728.

The previous prime is 65640019. The next prime is 65640049. The reversal of 65640022 is 22004656.

It is a super-2 number, since 2×65640022² = 8617224976320968, which contains 22 as substring.

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, 754 + ... + 11482.

It is an arithmetic number, because the mean of its divisors is an integer number (3862800).

Almost surely, 2^65640022 is an apocalyptic number.

65640022 is a deficient number, since it is larger than the sum of its proper divisors (57969578).

65640022 is a wasteful number, since it uses less digits than its factorization.

65640022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10780.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 65640022 is about 8101.8529979258. The cubic root of 65640022 is about 403.3879362058.

Adding to 65640022 its reverse (22004656), we get a palindrome (87644678).

The spelling of 65640022 in words is "sixty-five million, six hundred forty thousand, twenty-two".