66969228 has 12 divisors (see below), whose sum is σ = 156261560. Its totient is φ = 22323072.

The previous prime is 66969197. The next prime is 66969241. The reversal of 66969228 is 82296966.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2790373 + ... + 2790396.

Almost surely, 2^66969228 is an apocalyptic number.

It is an amenable number.

66969228 is an abundant number, since it is smaller than the sum of its proper divisors (89292332).

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

66969228 is a wasteful number, since it uses less digits than its factorization.

66969228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580776 (or 5580774 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 66969228 is about 8183.4728569233. The cubic root of 66969228 is about 406.0926204440.

The spelling of 66969228 in words is "sixty-six million, nine hundred sixty-nine thousand, two hundred twenty-eight".