66422728 has 16 divisors (see below), whose sum is σ = 126402480. Its totient is φ = 32715408.

The previous prime is 66422693. The next prime is 66422729. The reversal of 66422728 is 82722466.

It is not an unprimeable number, because it can be changed into a prime (66422729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61426 + ... + 62497.

It is an arithmetic number, because the mean of its divisors is an integer number (7900155).

Almost surely, 2^66422728 is an apocalyptic number.

It is an amenable number.

66422728 is a deficient number, since it is larger than the sum of its proper divisors (59979752).

66422728 is a wasteful number, since it uses less digits than its factorization.

66422728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123996 (or 123992 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

The square root of 66422728 is about 8150.0139877181. The cubic root of 66422728 is about 404.9849671807.

The spelling of 66422728 in words is "sixty-six million, four hundred twenty-two thousand, seven hundred twenty-eight".