56721833 has 8 divisors (see below), whose sum is σ = 65924160. Its totient is φ = 47794320.

The previous prime is 56721827. The next prime is 56721839. The reversal of 56721833 is 33812765.

It is an interprime number because it is at equal distance from previous prime (56721827) and next prime (56721839).

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

It is not a de Polignac number, because 56721833 - 2¹² = 56717737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56721793 and 56721802.

It is not an unprimeable number, because it can be changed into a prime (56721839) 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 7 ways as a sum of consecutive naturals, for example, 68258 + ... + 69083.

It is an arithmetic number, because the mean of its divisors is an integer number (8240520).

Almost surely, 2^56721833 is an apocalyptic number.

It is an amenable number.

56721833 is a deficient number, since it is larger than the sum of its proper divisors (9202327).

56721833 is a wasteful number, since it uses less digits than its factorization.

56721833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137407.

The product of its digits is 30240, while the sum is 35.

The square root of 56721833 is about 7531.3898451747. The cubic root of 56721833 is about 384.2230533711.

The spelling of 56721833 in words is "fifty-six million, seven hundred twenty-one thousand, eight hundred thirty-three".