66606428 has 12 divisors (see below), whose sum is σ = 133212912. Its totient is φ = 28545600.

The previous prime is 66606409. The next prime is 66606431. The reversal of 66606428 is 82460666.

66606428 is an admirable number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66606391 and 66606400.

It is a congruent number.

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, 1189373 + ... + 1189428.

It is an arithmetic number, because the mean of its divisors is an integer number (11101076).

Almost surely, 2^66606428 is an apocalyptic number.

It is an amenable number.

66606428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66606428 is a wasteful number, since it uses less digits than its factorization.

66606428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378812 (or 2378810 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 66606428 is about 8161.2761257049. The cubic root of 66606428 is about 405.3579683228.

The spelling of 66606428 in words is "sixty-six million, six hundred six thousand, four hundred twenty-eight".