56391216 has 80 divisors (see below), whose sum is σ = 173750784. Its totient is φ = 15409152.

The previous prime is 56391187. The next prime is 56391217. The reversal of 56391216 is 61219365.

It is a happy number.

56391216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (56391217) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4080 + ... + 11376.

Almost surely, 2^56391216 is an apocalyptic number.

56391216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56391216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86875392).

56391216 is an abundant number, since it is smaller than the sum of its proper divisors (117359568).

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

56391216 is a wasteful number, since it uses less digits than its factorization.

56391216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7338 (or 7332 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 56391216 is about 7509.4084986768. The cubic root of 56391216 is about 383.4750857393.

The spelling of 56391216 in words is "fifty-six million, three hundred ninety-one thousand, two hundred sixteen".