65918644 has 48 divisors (see below), whose sum is σ = 133902720. Its totient is φ = 28096640.

The previous prime is 65918609. The next prime is 65918647. The reversal of 65918644 is 44681956.

65918644 = T₁₈₆ + T₁₈₇ + ... + T₇₃₇.

It is a self number, because there is not a number n which added to its sum of digits gives 65918644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65918647) 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 15 ways as a sum of consecutive naturals, for example, 53022 + ... + 54250.

It is an arithmetic number, because the mean of its divisors is an integer number (2789640).

Almost surely, 2^65918644 is an apocalyptic number.

It is an amenable number.

65918644 is an abundant number, since it is smaller than the sum of its proper divisors (67984076).

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

65918644 is a wasteful number, since it uses less digits than its factorization.

65918644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320 (or 1318 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 65918644 is about 8119.0297449880. The cubic root of 65918644 is about 403.9578837252.

The spelling of 65918644 in words is "sixty-five million, nine hundred eighteen thousand, six hundred forty-four".