66287388 has 48 divisors (see below), whose sum is σ = 162449280. Its totient is φ = 21008064.

The previous prime is 66287341. The next prime is 66287489. The reversal of 66287388 is 88378266.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21895 + ... + 24737.

It is an arithmetic number, because the mean of its divisors is an integer number (3384360).

Almost surely, 2^66287388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66287388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81224640).

66287388 is an abundant number, since it is smaller than the sum of its proper divisors (96161892).

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

66287388 is a wasteful number, since it uses less digits than its factorization.

66287388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946 (or 2944 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 66287388 is about 8141.7067006863. The cubic root of 66287388 is about 404.7097203593.

The spelling of 66287388 in words is "sixty-six million, two hundred eighty-seven thousand, three hundred eighty-eight".