65808144 has 30 divisors (see below), whose sum is σ = 184171806. Its totient is φ = 21936000.

The previous prime is 65808143. The next prime is 65808151. The reversal of 65808144 is 44180856.

It can be written as a sum of positive squares in only one way, i.e., 65804544 + 3600 = 8112^2 + 60^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65808099 and 65808108.

It is not an unprimeable number, because it can be changed into a prime (65808143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 228357 + ... + 228644.

Almost surely, 2^65808144 is an apocalyptic number.

It is an amenable number.

65808144 is an abundant number, since it is smaller than the sum of its proper divisors (118363662).

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

65808144 is a wasteful number, since it uses less digits than its factorization.

65808144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457015 (or 457006 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 65808144 is about 8112.2218904564. The cubic root of 65808144 is about 403.7320381035.

The spelling of 65808144 in words is "sixty-five million, eight hundred eight thousand, one hundred forty-four".