56661228 has 48 divisors (see below), whose sum is σ = 158203360. Its totient is φ = 17433792.

The previous prime is 56661217. The next prime is 56661233. The reversal of 56661228 is 82216665.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 56661192 and 56661201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18775 + ... + 21582.

Almost surely, 2^56661228 is an apocalyptic number.

It is an amenable number.

56661228 is an abundant number, since it is smaller than the sum of its proper divisors (101542132).

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

56661228 is a wasteful number, since it uses less digits than its factorization.

56661228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40383 (or 40375 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 56661228 is about 7527.3652761109. The cubic root of 56661228 is about 384.0861623060.

The spelling of 56661228 in words is "fifty-six million, six hundred sixty-one thousand, two hundred twenty-eight".