55576440 has 96 divisors (see below), whose sum is σ = 181565280. Its totient is φ = 14743296.

The previous prime is 55576373. The next prime is 55576447. The reversal of 55576440 is 4467555.

It is a happy number.

55576440 is a `hidden beast` number, since 5 + 5 + 5 + 7 + 644 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 55576395 and 55576404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55576447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113877 + ... + 114363.

It is an arithmetic number, because the mean of its divisors is an integer number (1891305).

Almost surely, 2^55576440 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 55576440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90782640).

55576440 is an abundant number, since it is smaller than the sum of its proper divisors (125988840).

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

55576440 is a wasteful number, since it uses less digits than its factorization.

55576440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 36.

The square root of 55576440 is about 7454.9607644843. The cubic root of 55576440 is about 381.6192216364.

The spelling of 55576440 in words is "fifty-five million, five hundred seventy-six thousand, four hundred forty".