56721543 has 8 divisors (see below), whose sum is σ = 75686400. Its totient is φ = 37785528.

The previous prime is 56721523. The next prime is 56721551. The reversal of 56721543 is 34512765.

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

It is not a de Polignac number, because 56721543 - 2⁹ = 56721031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56721523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2103 + ... + 10856.

It is an arithmetic number, because the mean of its divisors is an integer number (9460800).

Almost surely, 2^56721543 is an apocalyptic number.

56721543 is a deficient number, since it is larger than the sum of its proper divisors (18964857).

56721543 is a wasteful number, since it uses less digits than its factorization.

56721543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14421.

The product of its digits is 25200, while the sum is 33.

The square root of 56721543 is about 7531.3705923955. The cubic root of 56721543 is about 384.2223985681. Note that the first 3 decimals are identical.

The spelling of 56721543 in words is "fifty-six million, seven hundred twenty-one thousand, five hundred forty-three".