65049781 has 8 divisors (see below), whose sum is σ = 65793024. Its totient is φ = 64310400.

The previous prime is 65049731. The next prime is 65049791. The reversal of 65049781 is 18794056.

65049781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65049781 - 2¹¹ = 65047733 is a prime.

It is a super-2 number, since 2×65049781² = 8462948016295922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65049731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44106 + ... + 45556.

It is an arithmetic number, because the mean of its divisors is an integer number (8224128).

Almost surely, 2^65049781 is an apocalyptic number.

It is an amenable number.

65049781 is a deficient number, since it is larger than the sum of its proper divisors (743243).

65049781 is a wasteful number, since it uses less digits than its factorization.

65049781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 65049781 is about 8065.3444439776. The cubic root of 65049781 is about 402.1751936402.

The spelling of 65049781 in words is "sixty-five million, forty-nine thousand, seven hundred eighty-one".