65821487 has 4 divisors (see below), whose sum is σ = 66083976. Its totient is φ = 65559000.

The previous prime is 65821471. The next prime is 65821489. The reversal of 65821487 is 78412856.

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 65821487 - 2⁴ = 65821471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65821489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130868 + ... + 131369.

It is an arithmetic number, because the mean of its divisors is an integer number (16520994).

Almost surely, 2^65821487 is an apocalyptic number.

65821487 is a deficient number, since it is larger than the sum of its proper divisors (262489).

65821487 is a wasteful number, since it uses less digits than its factorization.

65821487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262488.

The product of its digits is 107520, while the sum is 41.

The square root of 65821487 is about 8113.0442498485. The cubic root of 65821487 is about 403.7593226320.

The spelling of 65821487 in words is "sixty-five million, eight hundred twenty-one thousand, four hundred eighty-seven".