65640740 has 48 divisors (see below), whose sum is σ = 159231744. Its totient is φ = 22464000.

The previous prime is 65640739. The next prime is 65640749. The reversal of 65640740 is 4704656.

65640740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 65640697 and 65640706.

It is not an unprimeable number, because it can be changed into a prime (65640749) 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 15 ways as a sum of consecutive naturals, for example, 5036 + ... + 12515.

It is an arithmetic number, because the mean of its divisors is an integer number (3317328).

Almost surely, 2^65640740 is an apocalyptic number.

It is an amenable number.

65640740 is an abundant number, since it is smaller than the sum of its proper divisors (93591004).

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

65640740 is a wasteful number, since it uses less digits than its factorization.

65640740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17588 (or 17586 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 65640740 is about 8101.8973086555. The cubic root of 65640740 is about 403.3894070132.

The spelling of 65640740 in words is "sixty-five million, six hundred forty thousand, seven hundred forty".