56217620 has 12 divisors (see below), whose sum is σ = 118057044. Its totient is φ = 22487040.

The previous prime is 56217583. The next prime is 56217647. The reversal of 56217620 is 2671265.

It can be written as a sum of positive squares in 2 ways, for example, as 5779216 + 50438404 = 2404^2 + 7102^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1405421 + ... + 1405460.

It is an arithmetic number, because the mean of its divisors is an integer number (9838087).

Almost surely, 2^56217620 is an apocalyptic number.

It is an amenable number.

56217620 is an abundant number, since it is smaller than the sum of its proper divisors (61839424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56217620 is a wasteful number, since it uses less digits than its factorization.

56217620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810890 (or 2810888 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 56217620 is about 7497.8410225878. The cubic root of 56217620 is about 383.0811817905.

Adding to 56217620 its reverse (2671265), we get a palindrome (58888885).

The spelling of 56217620 in words is "fifty-six million, two hundred seventeen thousand, six hundred twenty".