66827220 has 24 divisors (see below), whose sum is σ = 187116384. Its totient is φ = 17820576.

The previous prime is 66827209. The next prime is 66827239. The reversal of 66827220 is 2272866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556834 + ... + 556953.

It is an arithmetic number, because the mean of its divisors is an integer number (7796516).

Almost surely, 2^66827220 is an apocalyptic number.

66827220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66827220 is an abundant number, since it is smaller than the sum of its proper divisors (120289164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66827220 is a wasteful number, since it uses less digits than its factorization.

66827220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113799 (or 1113797 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 66827220 is about 8174.7917404665. The cubic root of 66827220 is about 405.8053780168.

The spelling of 66827220 in words is "sixty-six million, eight hundred twenty-seven thousand, two hundred twenty".