66722230 has 48 divisors (see below), whose sum is σ = 127405872. Its totient is φ = 25147200.

The previous prime is 66722213. The next prime is 66722291. The reversal of 66722230 is 3222766.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 509265 + ... + 509395.

It is an arithmetic number, because the mean of its divisors is an integer number (2654289).

Almost surely, 2^66722230 is an apocalyptic number.

66722230 is a deficient number, since it is larger than the sum of its proper divisors (60683642).

66722230 is a wasteful number, since it uses less digits than its factorization.

66722230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 66722230 is about 8168.3676459866. The cubic root of 66722230 is about 405.5927508959.

Adding to 66722230 its reverse (3222766), we get a palindrome (69944996).

The spelling of 66722230 in words is "sixty-six million, seven hundred twenty-two thousand, two hundred thirty".