65549040 has 80 divisors (see below), whose sum is σ = 205085088. Its totient is φ = 17317888.

The previous prime is 65549039. The next prime is 65549053. The reversal of 65549040 is 4094556.

65549040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 65548992 and 65549010.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25912 + ... + 28328.

Almost surely, 2^65549040 is an apocalyptic number.

65549040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65549040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102542544).

65549040 is an abundant number, since it is smaller than the sum of its proper divisors (139536048).

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

65549040 is a wasteful number, since it uses less digits than its factorization.

65549040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546 (or 2540 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 65549040 is about 8096.2361625634. The cubic root of 65549040 is about 403.2014747049.

The spelling of 65549040 in words is "sixty-five million, five hundred forty-nine thousand, forty".