56212820 has 12 divisors (see below), whose sum is σ = 118046964. Its totient is φ = 22485120.

The previous prime is 56212813. The next prime is 56212823. The reversal of 56212820 is 2821265.

It can be written as a sum of positive squares in 2 ways, for example, as 39287824 + 16924996 = 6268^2 + 4114^2 .

It is a super-2 number, since 2×56212820² = 6319762264704800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56212820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56212823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405301 + ... + 1405340.

It is an arithmetic number, because the mean of its divisors is an integer number (9837247).

Almost surely, 2^56212820 is an apocalyptic number.

It is an amenable number.

56212820 is an abundant number, since it is smaller than the sum of its proper divisors (61834144).

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

56212820 is a wasteful number, since it uses less digits than its factorization.

56212820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810650 (or 2810648 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 56212820 is about 7497.5209236120. The cubic root of 56212820 is about 383.0702786726.

The spelling of 56212820 in words is "fifty-six million, two hundred twelve thousand, eight hundred twenty".