66688276 has 12 divisors (see below), whose sum is σ = 117908308. Its totient is φ = 33000192.

The previous prime is 66688273. The next prime is 66688291. The reversal of 66688276 is 67288666.

It can be written as a sum of positive squares in 2 ways, for example, as 36723600 + 29964676 = 6060^2 + 5474^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66688273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85551 + ... + 86326.

Almost surely, 2^66688276 is an apocalyptic number.

It is an amenable number.

66688276 is a deficient number, since it is larger than the sum of its proper divisors (51220032).

66688276 is a wasteful number, since it uses less digits than its factorization.

66688276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171978 (or 171976 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The square root of 66688276 is about 8166.2889980701. The cubic root of 66688276 is about 405.5239390822.

The spelling of 66688276 in words is "sixty-six million, six hundred eighty-eight thousand, two hundred seventy-six".