66888280 has 32 divisors (see below), whose sum is σ = 151471440. Its totient is φ = 26582400.

The previous prime is 66888271. The next prime is 66888287. The reversal of 66888280 is 8288866.

It is a self number, because there is not a number n which added to its sum of digits gives 66888280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66888287) 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, 955 + ... + 11605.

Almost surely, 2^66888280 is an apocalyptic number.

It is an amenable number.

66888280 is an abundant number, since it is smaller than the sum of its proper divisors (84583160).

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

66888280 is a wasteful number, since it uses less digits than its factorization.

66888280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10819 (or 10815 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 46.

The square root of 66888280 is about 8178.5255394845. The cubic root of 66888280 is about 405.9289351218.

The spelling of 66888280 in words is "sixty-six million, eight hundred eighty-eight thousand, two hundred eighty".