65189840 has 20 divisors (see below), whose sum is σ = 151566564. Its totient is φ = 26075904.

The previous prime is 65189837. The next prime is 65189851. The reversal of 65189840 is 4898156.

It can be written as a sum of positive squares in 2 ways, for example, as 43771456 + 21418384 = 6616^2 + 4628^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407357 + ... + 407516.

Almost surely, 2^65189840 is an apocalyptic number.

It is an amenable number.

65189840 is an abundant number, since it is smaller than the sum of its proper divisors (86376724).

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

65189840 is a wasteful number, since it uses less digits than its factorization.

65189840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814886 (or 814880 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 65189840 is about 8074.0225414597. The cubic root of 65189840 is about 402.4636285178.

The spelling of 65189840 in words is "sixty-five million, one hundred eighty-nine thousand, eight hundred forty".