18028076821 has 8 divisors (see below), whose sum is σ = 18849317760. Its totient is φ = 17209953552.

The previous prime is 18028076789. The next prime is 18028076851. The reversal of 18028076821 is 12867082081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18028076821 - 2⁵ = 18028076789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18028076851) 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, 767586 + ... + 790723.

It is an arithmetic number, because the mean of its divisors is an integer number (2356164720).

Almost surely, 2^18028076821 is an apocalyptic number.

It is an amenable number.

18028076821 is a deficient number, since it is larger than the sum of its proper divisors (821240939).

18028076821 is a wasteful number, since it uses less digits than its factorization.

18028076821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558835.

The product of its (nonzero) digits is 86016, while the sum is 43.

The spelling of 18028076821 in words is "eighteen billion, twenty-eight million, seventy-six thousand, eight hundred twenty-one".