66928444 has 48 divisors (see below), whose sum is σ = 131878656. Its totient is φ = 29462400.

The previous prime is 66928429. The next prime is 66928457. The reversal of 66928444 is 44482966.

It is a super-2 number, since 2×66928444² = 8958833232522272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66928444.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215049 + ... + 215359.

It is an arithmetic number, because the mean of its divisors is an integer number (2747472).

Almost surely, 2^66928444 is an apocalyptic number.

It is an amenable number.

66928444 is a deficient number, since it is larger than the sum of its proper divisors (64950212).

66928444 is a wasteful number, since it uses less digits than its factorization.

66928444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 464 counting only the distinct ones).

The product of its digits is 331776, while the sum is 43.

The square root of 66928444 is about 8180.9806258174. The cubic root of 66928444 is about 406.0101674272.

The spelling of 66928444 in words is "sixty-six million, nine hundred twenty-eight thousand, four hundred forty-four".