65997636 has 72 divisors (see below), whose sum is σ = 163487520. Its totient is φ = 20712960.

The previous prime is 65997611. The next prime is 65997641. The reversal of 65997636 is 63679956.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 680340 + ... + 680436.

It is an arithmetic number, because the mean of its divisors is an integer number (2270660).

Almost surely, 2^65997636 is an apocalyptic number.

It is an amenable number.

65997636 is an abundant number, since it is smaller than the sum of its proper divisors (97489884).

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

65997636 is a wasteful number, since it uses less digits than its factorization.

65997636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 192 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 51.

The square root of 65997636 is about 8123.8929091908. The cubic root of 65997636 is about 404.1191770089.

The spelling of 65997636 in words is "sixty-five million, nine hundred ninety-seven thousand, six hundred thirty-six".