66549628 has 36 divisors (see below), whose sum is σ = 130192272. Its totient is φ = 29658240.

The previous prime is 66549619. The next prime is 66549629. The reversal of 66549628 is 82694566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66549629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23193 + ... + 25903.

It is an arithmetic number, because the mean of its divisors is an integer number (3616452).

Almost surely, 2^66549628 is an apocalyptic number.

66549628 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66549628 is a deficient number, since it is larger than the sum of its proper divisors (63642644).

66549628 is a wasteful number, since it uses less digits than its factorization.

66549628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770 (or 2749 counting only the distinct ones).

The product of its digits is 622080, while the sum is 46.

The square root of 66549628 is about 8157.7955355598. The cubic root of 66549628 is about 405.2427097748.

The spelling of 66549628 in words is "sixty-six million, five hundred forty-nine thousand, six hundred twenty-eight".