65840487 has 4 divisors (see below), whose sum is σ = 87787320. Its totient is φ = 43893656.

The previous prime is 65840459. The next prime is 65840503. The reversal of 65840487 is 78404856.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65840487 - 2⁸ = 65840231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65840287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10973412 + ... + 10973417.

It is an arithmetic number, because the mean of its divisors is an integer number (21946830).

Almost surely, 2^65840487 is an apocalyptic number.

65840487 is a deficient number, since it is larger than the sum of its proper divisors (21946833).

65840487 is a wasteful number, since it uses less digits than its factorization.

65840487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21946832.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 65840487 is about 8114.2151191597. The cubic root of 65840487 is about 403.7981685543.

The spelling of 65840487 in words is "sixty-five million, eight hundred forty thousand, four hundred eighty-seven".