65645984 has 12 divisors (see below), whose sum is σ = 129240594. Its totient is φ = 32822976.

The previous prime is 65645977. The next prime is 65645989. The reversal of 65645984 is 48954656.

It can be written as a sum of positive squares in only one way, i.e., 43930384 + 21715600 = 6628^2 + 4660^2 .

It is not an unprimeable number, because it can be changed into a prime (65645989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025687 + ... + 1025750.

Almost surely, 2^65645984 is an apocalyptic number.

It is an amenable number.

65645984 is a deficient number, since it is larger than the sum of its proper divisors (63594610).

65645984 is a wasteful number, since it uses less digits than its factorization.

65645984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051447 (or 2051439 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 47.

The square root of 65645984 is about 8102.2209300907. The cubic root of 65645984 is about 403.4001489078.

The spelling of 65645984 in words is "sixty-five million, six hundred forty-five thousand, nine hundred eighty-four".