55549440 has 120 divisors (see below), whose sum is σ = 192463128. Its totient is φ = 14807040.

The previous prime is 55549433. The next prime is 55549451. The reversal of 55549440 is 4494555.

It is a tau number, because it is divible by the number of its divisors (120).

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 = 55549395 and 55549404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21835 + ... + 24245.

Almost surely, 2^55549440 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 55549440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96231564).

55549440 is an abundant number, since it is smaller than the sum of its proper divisors (136913688).

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

55549440 is a wasteful number, since it uses less digits than its factorization.

55549440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440 (or 2421 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 55549440 is about 7453.1496697705. The cubic root of 55549440 is about 381.5574125436.

The spelling of 55549440 in words is "fifty-five million, five hundred forty-nine thousand, four hundred forty".