66688296 has 32 divisors (see below), whose sum is σ = 167097600. Its totient is φ = 22179200.

The previous prime is 66688291. The next prime is 66688327. The reversal of 66688296 is 69288666.

It is not an unprimeable number, because it can be changed into a prime (66688291) 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, 8596 + ... + 14396.

It is an arithmetic number, because the mean of its divisors is an integer number (5221800).

Almost surely, 2^66688296 is an apocalyptic number.

It is an amenable number.

66688296 is an abundant number, since it is smaller than the sum of its proper divisors (100409304).

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

66688296 is a wasteful number, since it uses less digits than its factorization.

66688296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289 (or 6285 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 51.

The square root of 66688296 is about 8166.2902226164. The cubic root of 66688296 is about 405.5239796215.

The spelling of 66688296 in words is "sixty-six million, six hundred eighty-eight thousand, two hundred ninety-six".