66923270 has 16 divisors (see below), whose sum is σ = 121988160. Its totient is φ = 26430144.

The previous prime is 66923249. The next prime is 66923279. The reversal of 66923270 is 7232966.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66923270.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66923279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41567 + ... + 43146.

It is an arithmetic number, because the mean of its divisors is an integer number (7624260).

Almost surely, 2^66923270 is an apocalyptic number.

66923270 is a deficient number, since it is larger than the sum of its proper divisors (55064890).

66923270 is a wasteful number, since it uses less digits than its factorization.

66923270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84799.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66923270 is about 8180.6643984459. The cubic root of 66923270 is about 405.9997047568. Note that the first 3 decimals are identical.

The spelling of 66923270 in words is "sixty-six million, nine hundred twenty-three thousand, two hundred seventy".