56218420 has 12 divisors (see below), whose sum is σ = 118058724. Its totient is φ = 22487360.

The previous prime is 56218399. The next prime is 56218447. The reversal of 56218420 is 2481265.

It can be written as a sum of positive squares in 2 ways, for example, as 39012516 + 17205904 = 6246^2 + 4148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405441 + ... + 1405480.

It is an arithmetic number, because the mean of its divisors is an integer number (9838227).

Almost surely, 2^56218420 is an apocalyptic number.

It is an amenable number.

56218420 is an abundant number, since it is smaller than the sum of its proper divisors (61840304).

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

56218420 is a wasteful number, since it uses less digits than its factorization.

56218420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810930 (or 2810928 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 56218420 is about 7497.8943710885. The cubic root of 56218420 is about 383.0829989165.

Adding to 56218420 its reverse (2481265), we get a palindrome (58699685).

It can be divided in two parts, 5621 and 8420, that added together give a palindrome (14041).

The spelling of 56218420 in words is "fifty-six million, two hundred eighteen thousand, four hundred twenty".