56447820 has 384 divisors, whose sum is σ = 223534080. Its totient is φ = 11612160.

The previous prime is 56447759. The next prime is 56447821. The reversal of 56447820 is 2874465.

56447820 is a `hidden beast` number, since 5 + 644 + 7 + 8 + 2 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56447821) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1312719 + ... + 1312761.

It is an arithmetic number, because the mean of its divisors is an integer number (582120).

Almost surely, 2^56447820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56447820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111767040).

56447820 is an abundant number, since it is smaller than the sum of its proper divisors (167086260).

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

56447820 is a wasteful number, since it uses less digits than its factorization.

56447820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 56447820 is about 7513.1764254542. The cubic root of 56447820 is about 383.6033501904.

It can be divided in two parts, 564 and 47820, that added together give a palindrome (48384).

The spelling of 56447820 in words is "fifty-six million, four hundred forty-seven thousand, eight hundred twenty".