56815205 has 16 divisors (see below), whose sum is σ = 71869680. Its totient is φ = 43051008.

The previous prime is 56815201. The next prime is 56815259. The reversal of 56815205 is 50251865.

It can be written as a sum of positive squares in 8 ways, for example, as 954529 + 55860676 = 977^2 + 7474^2 .

It is a cyclic number.

It is not a de Polignac number, because 56815205 - 2² = 56815201 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 (56815201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3989 + ... + 11381.

It is an arithmetic number, because the mean of its divisors is an integer number (4491855).

Almost surely, 2^56815205 is an apocalyptic number.

It is an amenable number.

56815205 is a deficient number, since it is larger than the sum of its proper divisors (15054475).

56815205 is a wasteful number, since it uses less digits than its factorization.

56815205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7480.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 56815205 is about 7537.5861520781. The cubic root of 56815205 is about 384.4337659285.

The spelling of 56815205 in words is "fifty-six million, eight hundred fifteen thousand, two hundred five".