66277880 has 16 divisors (see below), whose sum is σ = 149125320. Its totient is φ = 26511136.

The previous prime is 66277879. The next prime is 66277889. The reversal of 66277880 is 8877266.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66277889) 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, 828434 + ... + 828513.

Almost surely, 2^66277880 is an apocalyptic number.

It is an amenable number.

66277880 is an abundant number, since it is smaller than the sum of its proper divisors (82847440).

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

66277880 is a wasteful number, since it uses less digits than its factorization.

66277880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656958 (or 1656954 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 66277880 is about 8141.1227726893. The cubic root of 66277880 is about 404.6903694484.

The spelling of 66277880 in words is "sixty-six million, two hundred seventy-seven thousand, eight hundred eighty".