65144988 has 18 divisors (see below), whose sum is σ = 164672144. Its totient is φ = 21714984.

The previous prime is 65144983. The next prime is 65145001. The reversal of 65144988 is 88944156.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65144983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 904756 + ... + 904827.

Almost surely, 2^65144988 is an apocalyptic number.

It is an amenable number.

65144988 is an abundant number, since it is smaller than the sum of its proper divisors (99527156).

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

65144988 is a wasteful number, since it uses less digits than its factorization.

65144988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809593 (or 1809588 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 65144988 is about 8071.2445137042. The cubic root of 65144988 is about 402.3713061551.

The spelling of 65144988 in words is "sixty-five million, one hundred forty-four thousand, nine hundred eighty-eight".