56535220 has 36 divisors (see below), whose sum is σ = 138109860. Its totient is φ = 19383168.

The previous prime is 56535197. The next prime is 56535221. The reversal of 56535220 is 2253565.

It can be written as a sum of positive squares in 2 ways, for example, as 13972644 + 42562576 = 3738^2 + 6524^2 .

It is a super-2 number, since 2×56535220² = 6392462200896800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56535221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27865 + ... + 29824.

It is an arithmetic number, because the mean of its divisors is an integer number (3836385).

Almost surely, 2^56535220 is an apocalyptic number.

It is an amenable number.

56535220 is an abundant number, since it is smaller than the sum of its proper divisors (81574640).

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

56535220 is a wasteful number, since it uses less digits than its factorization.

56535220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57712 (or 57703 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 56535220 is about 7518.9906237473. The cubic root of 56535220 is about 383.8012299553.

Adding to 56535220 its reverse (2253565), we get a palindrome (58788785).

The spelling of 56535220 in words is "fifty-six million, five hundred thirty-five thousand, two hundred twenty".