66242388 has 24 divisors (see below), whose sum is σ = 158336640. Its totient is φ = 21542080.

The previous prime is 66242359. The next prime is 66242389. The reversal of 66242388 is 88324266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66242389) 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, 66828 + ... + 67811.

It is an arithmetic number, because the mean of its divisors is an integer number (6597360).

Almost surely, 2^66242388 is an apocalyptic number.

It is an amenable number.

66242388 is an abundant number, since it is smaller than the sum of its proper divisors (92094252).

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

66242388 is a wasteful number, since it uses less digits than its factorization.

66242388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134687 (or 134685 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 66242388 is about 8138.9426831745. The cubic root of 66242388 is about 404.6181189217.

The spelling of 66242388 in words is "sixty-six million, two hundred forty-two thousand, three hundred eighty-eight".