66025240 has 32 divisors (see below), whose sum is σ = 148793760. Its totient is φ = 26368000.

The previous prime is 66025231. The next prime is 66025291. The reversal of 66025240 is 4252066.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40440 + ... + 42040.

It is an arithmetic number, because the mean of its divisors is an integer number (4649805).

Almost surely, 2^66025240 is an apocalyptic number.

It is an amenable number.

66025240 is an abundant number, since it is smaller than the sum of its proper divisors (82768520).

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

66025240 is a wasteful number, since it uses less digits than its factorization.

66025240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643 (or 2639 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 66025240 is about 8125.5916707647. The cubic root of 66025240 is about 404.1755111018.

The spelling of 66025240 in words is "sixty-six million, twenty-five thousand, two hundred forty".