56511220 has 12 divisors (see below), whose sum is σ = 118673604. Its totient is φ = 22604480.

The previous prime is 56511209. The next prime is 56511239. The reversal of 56511220 is 2211565.

It can be written as a sum of positive squares in 2 ways, for example, as 39388176 + 17123044 = 6276^2 + 4138^2 .

It is a junction number, because it is equal to n+sod(n) for n = 56511191 and 56511200.

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, 1412761 + ... + 1412800.

It is an arithmetic number, because the mean of its divisors is an integer number (9889467).

Almost surely, 2^56511220 is an apocalyptic number.

It is an amenable number.

56511220 is an abundant number, since it is smaller than the sum of its proper divisors (62162384).

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

56511220 is a wasteful number, since it uses less digits than its factorization.

56511220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825570 (or 2825568 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 56511220 is about 7517.3944954352. The cubic root of 56511220 is about 383.7469125861.

Adding to 56511220 its reverse (2211565), we get a palindrome (58722785).

The spelling of 56511220 in words is "fifty-six million, five hundred eleven thousand, two hundred twenty".