66751230 has 128 divisors (see below), whose sum is σ = 201600000. Its totient is φ = 14055552.

The previous prime is 66751193. The next prime is 66751249. The reversal of 66751230 is 3215766.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 133521 + ... + 134019.

It is an arithmetic number, because the mean of its divisors is an integer number (1575000).

Almost surely, 2^66751230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66751230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100800000).

66751230 is an abundant number, since it is smaller than the sum of its proper divisors (134848770).

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

66751230 is a wasteful number, since it uses less digits than its factorization.

66751230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 66751230 is about 8170.1425936149. The cubic root of 66751230 is about 405.6515043582.

Adding to 66751230 its reverse (3215766), we get a palindrome (69966996).

The spelling of 66751230 in words is "sixty-six million, seven hundred fifty-one thousand, two hundred thirty".