66238788 has 180 divisors, whose sum is σ = 208618480. Its totient is φ = 16299360.

The previous prime is 66238751. The next prime is 66238793. The reversal of 66238788 is 88783266.

It is a happy number.

Its product of digits (774144) is a multiple of the sum of its prime divisors (42).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3486243 + ... + 3486261.

Almost surely, 2^66238788 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 66238788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104309240).

66238788 is an abundant number, since it is smaller than the sum of its proper divisors (142379692).

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

66238788 is a wasteful number, since it uses less digits than its factorization.

66238788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 42 counting only the distinct ones).

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

The square root of 66238788 is about 8138.7215212219. The cubic root of 66238788 is about 404.6107890148.

The spelling of 66238788 in words is "sixty-six million, two hundred thirty-eight thousand, seven hundred eighty-eight".