56816550 has 144 divisors (see below), whose sum is σ = 184889952. Its totient is φ = 12211200.

The previous prime is 56816549. The next prime is 56816581. The reversal of 56816550 is 5561865.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 53020 + ... + 54080.

It is an arithmetic number, because the mean of its divisors is an integer number (1283958).

Almost surely, 2^56816550 is an apocalyptic number.

56816550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 56816550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92444976).

56816550 is an abundant number, since it is smaller than the sum of its proper divisors (128073402).

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

56816550 is a wasteful number, since it uses less digits than its factorization.

56816550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 56816550 is about 7537.6753710942. The cubic root of 56816550 is about 384.4367995022.

The spelling of 56816550 in words is "fifty-six million, eight hundred sixteen thousand, five hundred fifty".