56180721 has 8 divisors (see below), whose sum is σ = 75367840. Its totient is φ = 37223712.

The previous prime is 56180717. The next prime is 56180731. The reversal of 56180721 is 12708165.

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

It is not a de Polignac number, because 56180721 - 2² = 56180717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56180731) 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, 56956 + ... + 57933.

It is an arithmetic number, because the mean of its divisors is an integer number (9420980).

Almost surely, 2^56180721 is an apocalyptic number.

It is an amenable number.

56180721 is a deficient number, since it is larger than the sum of its proper divisors (19187119).

56180721 is a wasteful number, since it uses less digits than its factorization.

56180721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115055.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 56180721 is about 7495.3799770258. The cubic root of 56180721 is about 382.9973503851.

Adding to 56180721 its reverse (12708165), we get a palindrome (68888886).

The spelling of 56180721 in words is "fifty-six million, one hundred eighty thousand, seven hundred twenty-one".