56721801 has 8 divisors (see below), whose sum is σ = 75781440. Its totient is φ = 37738352.

The previous prime is 56721799. The next prime is 56721811. The reversal of 56721801 is 10812765.

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 56721801 - 2¹ = 56721799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56721811) 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, 17286 + ... + 20303.

It is an arithmetic number, because the mean of its divisors is an integer number (9472680).

Almost surely, 2^56721801 is an apocalyptic number.

It is an amenable number.

56721801 is a deficient number, since it is larger than the sum of its proper divisors (19059639).

56721801 is a wasteful number, since it uses less digits than its factorization.

56721801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38095.

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

The square root of 56721801 is about 7531.3877207325. The cubic root of 56721801 is about 384.2229811171. Note that the first 3 decimals are identical.

The spelling of 56721801 in words is "fifty-six million, seven hundred twenty-one thousand, eight hundred one".