55055440 has 40 divisors (see below), whose sum is σ = 139642848. Its totient is φ = 20019840.

The previous prime is 55055431. The next prime is 55055443. The reversal of 55055440 is 4455055.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×55055440² = 6062202947187200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55055399 and 55055408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55055443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30402 + ... + 32161.

Almost surely, 2^55055440 is an apocalyptic number.

It is an amenable number.

55055440 is an abundant number, since it is smaller than the sum of its proper divisors (84587408).

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

55055440 is a wasteful number, since it uses less digits than its factorization.

55055440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62587 (or 62581 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 55055440 is about 7419.9353096910. The cubic root of 55055440 is about 380.4229823690.

The spelling of 55055440 in words is "fifty-five million, fifty-five thousand, four hundred forty".