66273730 has 8 divisors (see below), whose sum is σ = 119292732. Its totient is φ = 26509488.

The previous prime is 66273719. The next prime is 66273733. The reversal of 66273730 is 3737266.

It is a happy number.

66273730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 65173329 + 1100401 = 8073^2 + 1049^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66273730² = 8784414576225800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66273733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3313677 + ... + 3313696.

Almost surely, 2^66273730 is an apocalyptic number.

66273730 is a deficient number, since it is larger than the sum of its proper divisors (53019002).

66273730 is a wasteful number, since it uses less digits than its factorization.

66273730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6627380.

The product of its (nonzero) digits is 31752, while the sum is 34.

The square root of 66273730 is about 8140.8678898506. The cubic root of 66273730 is about 404.6819226882.

Subtracting from 66273730 its reverse (3737266), we obtain a square (62536464 = 7908²).

The spelling of 66273730 in words is "sixty-six million, two hundred seventy-three thousand, seven hundred thirty".