66967888 has 20 divisors (see below), whose sum is σ = 139731508. Its totient is φ = 30908160.

The previous prime is 66967871. The next prime is 66967889. The reversal of 66967888 is 88876966.

It can be written as a sum of positive squares in 2 ways, for example, as 22771984 + 44195904 = 4772^2 + 6648^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66967889) 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, 160773 + ... + 161188.

Almost surely, 2^66967888 is an apocalyptic number.

It is an amenable number.

66967888 is an abundant number, since it is smaller than the sum of its proper divisors (72763620).

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

66967888 is a wasteful number, since it uses less digits than its factorization.

66967888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321982 (or 321976 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The square root of 66967888 is about 8183.3909841825. The cubic root of 66967888 is about 406.0899118978.

The spelling of 66967888 in words is "sixty-six million, nine hundred sixty-seven thousand, eight hundred eighty-eight".