66569240 has 32 divisors (see below), whose sum is σ = 153437760. Its totient is φ = 25977600.

The previous prime is 66569233. The next prime is 66569267. The reversal of 66569240 is 4296566.

It is a junction number, because it is equal to n+sod(n) for n = 66569194 and 66569203.

It is a congruent number.

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, 18656 + ... + 21935.

It is an arithmetic number, because the mean of its divisors is an integer number (4794930).

Almost surely, 2^66569240 is an apocalyptic number.

It is an amenable number.

66569240 is an abundant number, since it is smaller than the sum of its proper divisors (86868520).

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

66569240 is a wasteful number, since it uses less digits than its factorization.

66569240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40643 (or 40639 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 66569240 is about 8158.9974874368. The cubic root of 66569240 is about 405.2825138512.

The spelling of 66569240 in words is "sixty-six million, five hundred sixty-nine thousand, two hundred forty".