66878588 has 24 divisors (see below), whose sum is σ = 136870272. Its totient is φ = 27995184.

The previous prime is 66878587. The next prime is 66878597. The reversal of 66878588 is 88587866.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66878587) 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, 26570 + ... + 28977.

It is an arithmetic number, because the mean of its divisors is an integer number (5702928).

Almost surely, 2^66878588 is an apocalyptic number.

It is an amenable number.

66878588 is an abundant number, since it is smaller than the sum of its proper divisors (69991684).

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

66878588 is a wasteful number, since it uses less digits than its factorization.

66878588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55601 (or 55599 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 56.

The square root of 66878588 is about 8177.9329906768. The cubic root of 66878588 is about 405.9093280333.

It can be divided in two parts, 6687858 and 8, that added together give a palindrome (6687866).

The spelling of 66878588 in words is "sixty-six million, eight hundred seventy-eight thousand, five hundred eighty-eight".