65622440 has 64 divisors (see below), whose sum is σ = 160770960. Its totient is φ = 23961600.

The previous prime is 65622437. The next prime is 65622451. The reversal of 65622440 is 4422656.

65622440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 948676 + 64673764 = 974^2 + 8042^2 .

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, 49790 + ... + 51090.

Almost surely, 2^65622440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65622440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80385480).

65622440 is an abundant number, since it is smaller than the sum of its proper divisors (95148520).

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

65622440 is a wasteful number, since it uses less digits than its factorization.

65622440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422 (or 1418 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 65622440 is about 8100.7678648385. The cubic root of 65622440 is about 403.3519165143.

The spelling of 65622440 in words is "sixty-five million, six hundred twenty-two thousand, four hundred forty".