66688872 has 32 divisors (see below), whose sum is σ = 170602080. Its totient is φ = 21712320.

The previous prime is 66688847. The next prime is 66688873. The reversal of 66688872 is 27888666.

It is not an unprimeable number, because it can be changed into a prime (66688873) 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, 31279 + ... + 33342.

It is an arithmetic number, because the mean of its divisors is an integer number (5331315).

Almost surely, 2^66688872 is an apocalyptic number.

It is an amenable number.

66688872 is an abundant number, since it is smaller than the sum of its proper divisors (103913208).

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

66688872 is a wasteful number, since it uses less digits than its factorization.

66688872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64673 (or 64669 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 51.

The square root of 66688872 is about 8166.3254894720. The cubic root of 66688872 is about 405.5251471484.

The spelling of 66688872 in words is "sixty-six million, six hundred eighty-eight thousand, eight hundred seventy-two".