666461928 has 32 divisors (see below), whose sum is σ = 1817624160. Its totient is φ = 201958080.

The previous prime is 666461923. The next prime is 666461941. The reversal of 666461928 is 829164666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666461921) by changing a digit.

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, 1261975 + ... + 1262502.

It is an arithmetic number, because the mean of its divisors is an integer number (56800755).

Almost surely, 2^666461928 is an apocalyptic number.

It is an amenable number.

666461928 is an abundant number, since it is smaller than the sum of its proper divisors (1151162232).

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

666461928 is a wasteful number, since it uses less digits than its factorization.

666461928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524497 (or 2524493 counting only the distinct ones).

The product of its digits is 746496, while the sum is 48.

The square root of 666461928 is about 25815.9239230363. The cubic root of 666461928 is about 873.4910277303.

The spelling of 666461928 in words is "six hundred sixty-six million, four hundred sixty-one thousand, nine hundred twenty-eight".