65985864 has 64 divisors (see below), whose sum is σ = 189143040. Its totient is φ = 18792000.

The previous prime is 65985863. The next prime is 65985869. The reversal of 65985864 is 46858956.

It is not an unprimeable number, because it can be changed into a prime (65985863) 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, 87489 + ... + 88239.

It is an arithmetic number, because the mean of its divisors is an integer number (2955360).

Almost surely, 2^65985864 is an apocalyptic number.

It is an amenable number.

65985864 is an abundant number, since it is smaller than the sum of its proper divisors (123157176).

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

65985864 is a wasteful number, since it uses less digits than its factorization.

65985864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290 (or 1286 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 51.

The square root of 65985864 is about 8123.1683473876. The cubic root of 65985864 is about 404.0951479976.

The spelling of 65985864 in words is "sixty-five million, nine hundred eighty-five thousand, eight hundred sixty-four".