66375988 has 48 divisors (see below), whose sum is σ = 137088000. Its totient is φ = 28106400.

The previous prime is 66375977. The next prime is 66376001. The reversal of 66375988 is 88957366.

It is a super-2 number, since 2×66375988² = 8811543565952288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138333 + ... + 138811.

It is an arithmetic number, because the mean of its divisors is an integer number (2856000).

Almost surely, 2^66375988 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 66375988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68544000).

66375988 is an abundant number, since it is smaller than the sum of its proper divisors (70712012).

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

66375988 is a wasteful number, since it uses less digits than its factorization.

66375988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 589 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The square root of 66375988 is about 8147.1460033560. The cubic root of 66375988 is about 404.8899523184.

The spelling of 66375988 in words is "sixty-six million, three hundred seventy-five thousand, nine hundred eighty-eight".