56605821 has 8 divisors (see below), whose sum is σ = 76601184. Its totient is φ = 37173840.

The previous prime is 56605817. The next prime is 56605831. The reversal of 56605821 is 12850665.

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

It is not a de Polignac number, because 56605821 - 2² = 56605817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56605811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140610 + ... + 141011.

It is an arithmetic number, because the mean of its divisors is an integer number (9575148).

Almost surely, 2^56605821 is an apocalyptic number.

It is an amenable number.

56605821 is a deficient number, since it is larger than the sum of its proper divisors (19995363).

56605821 is a wasteful number, since it uses less digits than its factorization.

56605821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281691.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 56605821 is about 7523.6840045286. The cubic root of 56605821 is about 383.9609267426.

The spelling of 56605821 in words is "fifty-six million, six hundred five thousand, eight hundred twenty-one".