56821018 has 8 divisors (see below), whose sum is σ = 85294548. Its totient is φ = 28389504.

The previous prime is 56821007. The next prime is 56821019. The reversal of 56821018 is 81012865.

It can be written as a sum of positive squares in 2 ways, for example, as 43520409 + 13300609 = 6597^2 + 3647^2 .

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

It is not an unprimeable number, because it can be changed into a prime (56821019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6871 + ... + 12682.

Almost surely, 2^56821018 is an apocalyptic number.

56821018 is a deficient number, since it is larger than the sum of its proper divisors (28473530).

56821018 is a wasteful number, since it uses less digits than its factorization.

56821018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21008.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 56821018 is about 7537.9717431150. The cubic root of 56821018 is about 384.4468764874.

The spelling of 56821018 in words is "fifty-six million, eight hundred twenty-one thousand, eighteen".