66880828 has 24 divisors (see below), whose sum is σ = 134572032. Its totient is φ = 28489584.

The previous prime is 66880811. The next prime is 66880841. The reversal of 66880828 is 82808866.

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, 2476 + ... + 11827.

It is an arithmetic number, because the mean of its divisors is an integer number (5607168).

Almost surely, 2^66880828 is an apocalyptic number.

It is an amenable number.

66880828 is an abundant number, since it is smaller than the sum of its proper divisors (67691204).

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

66880828 is a wasteful number, since it uses less digits than its factorization.

66880828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14481 (or 14479 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 46.

The square root of 66880828 is about 8178.0699434524. The cubic root of 66880828 is about 405.9138597614.

It can be divided in two parts, 668 and 80828, that multiplied together give a square (53993104 = 7348²).

The spelling of 66880828 in words is "sixty-six million, eight hundred eighty thousand, eight hundred twenty-eight".