55582440 has 64 divisors (see below), whose sum is σ = 168264000. Its totient is φ = 14687232.

The previous prime is 55582427. The next prime is 55582447. The reversal of 55582440 is 4428555.

It is not an unprimeable number, because it can be changed into a prime (55582447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11511 + ... + 15609.

It is an arithmetic number, because the mean of its divisors is an integer number (2629125).

Almost surely, 2^55582440 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 55582440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84132000).

55582440 is an abundant number, since it is smaller than the sum of its proper divisors (112681560).

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

55582440 is a wasteful number, since it uses less digits than its factorization.

55582440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4226 (or 4222 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 33.

The square root of 55582440 is about 7455.3631702285. The cubic root of 55582440 is about 381.6329542716.

The spelling of 55582440 in words is "fifty-five million, five hundred eighty-two thousand, four hundred forty".