65144040 has 64 divisors (see below), whose sum is σ = 210470400. Its totient is φ = 16035072.

The previous prime is 65144003. The next prime is 65144041. The reversal of 65144040 is 4044156.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 65144040.

It is not an unprimeable number, because it can be changed into a prime (65144041) 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 15 ways as a sum of consecutive naturals, for example, 19320 + ... + 22439.

It is an arithmetic number, because the mean of its divisors is an integer number (3288600).

Almost surely, 2^65144040 is an apocalyptic number.

65144040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65144040 is an abundant number, since it is smaller than the sum of its proper divisors (145326360).

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

65144040 is a wasteful number, since it uses less digits than its factorization.

65144040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41786 (or 41782 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 65144040 is about 8071.1857864876. The cubic root of 65144040 is about 402.3693543557.

Adding to 65144040 its reverse (4044156), we get a palindrome (69188196).

The spelling of 65144040 in words is "sixty-five million, one hundred forty-four thousand, forty".