66671828 has 6 divisors (see below), whose sum is σ = 116675706. Its totient is φ = 33335912.

The previous prime is 66671809. The next prime is 66671831. The reversal of 66671828 is 82817666.

It can be written as a sum of positive squares in only one way, i.e., 45859984 + 20811844 = 6772^2 + 4562^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333975 + ... + 8333982.

It is an arithmetic number, because the mean of its divisors is an integer number (19445951).

Almost surely, 2^66671828 is an apocalyptic number.

It is an amenable number.

66671828 is a deficient number, since it is larger than the sum of its proper divisors (50003878).

66671828 is a wasteful number, since it uses less digits than its factorization.

66671828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16667961 (or 16667959 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 66671828 is about 8165.2818689865. The cubic root of 66671828 is about 405.4905968588.

The spelling of 66671828 in words is "sixty-six million, six hundred seventy-one thousand, eight hundred twenty-eight".