66007228 has 24 divisors (see below), whose sum is σ = 132193152. Its totient is φ = 28250544.

The previous prime is 66007211. The next prime is 66007231. The reversal of 66007228 is 82270066.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66007228.

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, 31551 + ... + 33577.

It is an arithmetic number, because the mean of its divisors is an integer number (5508048).

Almost surely, 2^66007228 is an apocalyptic number.

It is an amenable number.

66007228 is an abundant number, since it is smaller than the sum of its proper divisors (66185924).

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

66007228 is a wasteful number, since it uses less digits than its factorization.

66007228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201 (or 3199 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 66007228 is about 8124.4832451055. The cubic root of 66007228 is about 404.1387540908.

The spelling of 66007228 in words is "sixty-six million, seven thousand, two hundred twenty-eight".