65781023 has 8 divisors (see below), whose sum is σ = 82012800. Its totient is φ = 51257880.

The previous prime is 65781017. The next prime is 65781031. The reversal of 65781023 is 32018756.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65781023 - 2¹⁰ = 65779999 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 (65781043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427073 + ... + 427226.

It is an arithmetic number, because the mean of its divisors is an integer number (10251600).

Almost surely, 2^65781023 is an apocalyptic number.

65781023 is a deficient number, since it is larger than the sum of its proper divisors (16231777).

65781023 is a wasteful number, since it uses less digits than its factorization.

65781023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854317.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 65781023 is about 8110.5501046476. The cubic root of 65781023 is about 403.6765681648.

Adding to 65781023 its reverse (32018756), we get a palindrome (97799779).

The spelling of 65781023 in words is "sixty-five million, seven hundred eighty-one thousand, twenty-three".