66722272 has 24 divisors (see below), whose sum is σ = 135891000. Its totient is φ = 32210304.

The previous prime is 66722213. The next prime is 66722291. The reversal of 66722272 is 27222766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35022 + ... + 36877.

It is an arithmetic number, because the mean of its divisors is an integer number (5662125).

Almost surely, 2^66722272 is an apocalyptic number.

It is an amenable number.

66722272 is an abundant number, since it is smaller than the sum of its proper divisors (69168728).

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

66722272 is a wasteful number, since it uses less digits than its factorization.

66722272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71938 (or 71930 counting only the distinct ones).

The product of its digits is 28224, while the sum is 34.

The square root of 66722272 is about 8168.3702168793. The cubic root of 66722272 is about 405.5928359994.

The spelling of 66722272 in words is "sixty-six million, seven hundred twenty-two thousand, two hundred seventy-two".