80406866 has 4 divisors (see below), whose sum is σ = 120610302. Its totient is φ = 40203432.

The previous prime is 80406857. The next prime is 80406877. The reversal of 80406866 is 66860408.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66080641 + 14326225 = 8129^2 + 3785^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20101715 + ... + 20101718.

Almost surely, 2^80406866 is an apocalyptic number.

80406866 is a deficient number, since it is larger than the sum of its proper divisors (40203436).

80406866 is a wasteful number, since it uses less digits than its factorization.

80406866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40203435.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 80406866 is about 8966.9875655094. The cubic root of 80406866 is about 431.6161749966.

The spelling of 80406866 in words is "eighty million, four hundred six thousand, eight hundred sixty-six".