56128866 has 16 divisors (see below), whose sum is σ = 118861344. Its totient is φ = 17609024.

The previous prime is 56128847. The next prime is 56128903. The reversal of 56128866 is 66882165.

56128866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275040 + ... + 275243.

It is an arithmetic number, because the mean of its divisors is an integer number (7428834).

Almost surely, 2^56128866 is an apocalyptic number.

56128866 is an abundant number, since it is smaller than the sum of its proper divisors (62732478).

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

56128866 is a wasteful number, since it uses less digits than its factorization.

56128866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550305.

The product of its digits is 138240, while the sum is 42.

The square root of 56128866 is about 7491.9200476246. The cubic root of 56128866 is about 382.8794781520.

The spelling of 56128866 in words is "fifty-six million, one hundred twenty-eight thousand, eight hundred sixty-six".