66264040 has 32 divisors (see below), whose sum is σ = 153127080. Its totient is φ = 25788672.

The previous prime is 66264013. The next prime is 66264049. The reversal of 66264040 is 4046266.

It can be written as a sum of positive squares in 4 ways, for example, as 64866916 + 1397124 = 8054^2 + 1182^2 .

It is not an unprimeable number, because it can be changed into a prime (66264049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20907 + ... + 23866.

Almost surely, 2^66264040 is an apocalyptic number.

It is an amenable number.

66264040 is an abundant number, since it is smaller than the sum of its proper divisors (86863040).

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

66264040 is a wasteful number, since it uses less digits than its factorization.

66264040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44821 (or 44817 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66264040 is about 8140.2727227041. The cubic root of 66264040 is about 404.6621986388.

The spelling of 66264040 in words is "sixty-six million, two hundred sixty-four thousand, forty".