66324560 has 20 divisors (see below), whose sum is σ = 154204788. Its totient is φ = 26529792.

The previous prime is 66324547. The next prime is 66324613. The reversal of 66324560 is 6542366.

It can be written as a sum of positive squares in 2 ways, for example, as 9412624 + 56911936 = 3068^2 + 7544^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414449 + ... + 414608.

Almost surely, 2^66324560 is an apocalyptic number.

It is an amenable number.

66324560 is an abundant number, since it is smaller than the sum of its proper divisors (87880228).

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

66324560 is a wasteful number, since it uses less digits than its factorization.

66324560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829070 (or 829064 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 66324560 is about 8143.9891944918. The cubic root of 66324560 is about 404.7853559566.

The spelling of 66324560 in words is "sixty-six million, three hundred twenty-four thousand, five hundred sixty".