66224740 has 24 divisors (see below), whose sum is σ = 139277880. Its totient is φ = 26450688.

The previous prime is 66224731. The next prime is 66224759. The reversal of 66224740 is 4742266.

It can be written as a sum of positive squares in 4 ways, for example, as 14930496 + 51294244 = 3864^2 + 7162^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14134 + ... + 18226.

It is an arithmetic number, because the mean of its divisors is an integer number (5803245).

Almost surely, 2^66224740 is an apocalyptic number.

It is an amenable number.

66224740 is an abundant number, since it is smaller than the sum of its proper divisors (73053140).

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

66224740 is a wasteful number, since it uses less digits than its factorization.

66224740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4911 (or 4909 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 66224740 is about 8137.8584406464. The cubic root of 66224740 is about 404.5821835486.

The spelling of 66224740 in words is "sixty-six million, two hundred twenty-four thousand, seven hundred forty".