127920666 has 16 divisors (see below), whose sum is σ = 255996000. Its totient is φ = 42614448.

The previous prime is 127920659. The next prime is 127920677. The reversal of 127920666 is 666029721.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6225 + ... + 17163.

It is an arithmetic number, because the mean of its divisors is an integer number (15999750).

Almost surely, 2^127920666 is an apocalyptic number.

127920666 is an abundant number, since it is smaller than the sum of its proper divisors (128075334).

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

127920666 is a wasteful number, since it uses less digits than its factorization.

127920666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12893.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 127920666 is about 11310.2018549626. The cubic root of 127920666 is about 503.8642790890.

It can be divided in two parts, 1279 and 20666, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 127920666 in words is "one hundred twenty-seven million, nine hundred twenty thousand, six hundred sixty-six".