66613088 has 36 divisors (see below), whose sum is σ = 138465180. Its totient is φ = 31458240.

The previous prime is 66613081. The next prime is 66613097. The reversal of 66613088 is 88031666.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66613081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 201083 + ... + 201413.

It is an arithmetic number, because the mean of its divisors is an integer number (3846255).

Almost surely, 2^66613088 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 66613088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69232590).

66613088 is an abundant number, since it is smaller than the sum of its proper divisors (71852092).

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

66613088 is an equidigital number, since it uses as much as digits as its factorization.

66613088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 66613088 is about 8161.6841399309. The cubic root of 66613088 is about 405.3714785008.

Multiplying 66613088 by its sum of digits (38), we get a square (2531297344 = 50312²).

66613088 divided by its sum of digits (38) gives a square (1752976 = 1324²).

The spelling of 66613088 in words is "sixty-six million, six hundred thirteen thousand, eighty-eight".