56621656 has 96 divisors (see below), whose sum is σ = 136745280. Its totient is φ = 21772800.

The previous prime is 56621641. The next prime is 56621657. The reversal of 56621656 is 65612665.

56621656 = T₁₆₈ + T₁₆₉ + ... + T₇₀₀.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56621657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208801 + ... + 209071.

It is an arithmetic number, because the mean of its divisors is an integer number (1424430).

Almost surely, 2^56621656 is an apocalyptic number.

56621656 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 56621656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68372640).

56621656 is an abundant number, since it is smaller than the sum of its proper divisors (80123624).

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

56621656 is a wasteful number, since it uses less digits than its factorization.

56621656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 334 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 56621656 is about 7524.7362744484. The cubic root of 56621656 is about 383.9967266793.

It can be divided in two parts, 566 and 21656, that added together give a palindrome (22222).

The spelling of 56621656 in words is "fifty-six million, six hundred twenty-one thousand, six hundred fifty-six".