66631488 has 112 divisors (see below), whose sum is σ = 219846144. Its totient is φ = 17303040.

The previous prime is 66631471. The next prime is 66631489. The reversal of 66631488 is 88413666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66631489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12531 + ... + 17037.

It is an arithmetic number, because the mean of its divisors is an integer number (1962912).

Almost surely, 2^66631488 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 66631488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109923072).

66631488 is an abundant number, since it is smaller than the sum of its proper divisors (153214656).

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

66631488 is a wasteful number, since it uses less digits than its factorization.

66631488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540 (or 4530 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 66631488 is about 8162.8112804352. The cubic root of 66631488 is about 405.4087992374.

The spelling of 66631488 in words is "sixty-six million, six hundred thirty-one thousand, four hundred eighty-eight".