55055540 has 24 divisors (see below), whose sum is σ = 121702560. Its totient is φ = 20863008.

The previous prime is 55055479. The next prime is 55055569. The reversal of 55055540 is 4555055.

It is a super-2 number, since 2×55055540² = 6062224969383200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72062 + ... + 72821.

It is an arithmetic number, because the mean of its divisors is an integer number (5070940).

Almost surely, 2^55055540 is an apocalyptic number.

It is an amenable number.

55055540 is an abundant number, since it is smaller than the sum of its proper divisors (66647020).

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

55055540 is a wasteful number, since it uses less digits than its factorization.

55055540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144911 (or 144909 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 29.

The square root of 55055540 is about 7419.9420482912. The cubic root of 55055540 is about 380.4232126961.

The spelling of 55055540 in words is "fifty-five million, fifty-five thousand, five hundred forty".