65640624 has 40 divisors (see below), whose sum is σ = 193797120. Its totient is φ = 18754368.

The previous prime is 65640599. The next prime is 65640629. The reversal of 65640624 is 42604656.

65640624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65640629) 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, 97344 + ... + 98015.

It is an arithmetic number, because the mean of its divisors is an integer number (4844928).

Almost surely, 2^65640624 is an apocalyptic number.

It is an amenable number.

65640624 is an abundant number, since it is smaller than the sum of its proper divisors (128156496).

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

65640624 is a wasteful number, since it uses less digits than its factorization.

65640624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195377 (or 195371 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 65640624 is about 8101.8901498354. The cubic root of 65640624 is about 403.3891693905.

The spelling of 65640624 in words is "sixty-five million, six hundred forty thousand, six hundred twenty-four".