55955550 has 144 divisors (see below), whose sum is σ = 168953472. Its totient is φ = 12196800.

The previous prime is 55955533. The next prime is 55955561. The reversal of 55955550 is 5555955.

It is a junction number, because it is equal to n+sod(n) for n = 55955499 and 55955508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 168885 + ... + 169215.

It is an arithmetic number, because the mean of its divisors is an integer number (1173288).

Almost surely, 2^55955550 is an apocalyptic number.

55955550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55955550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84476736).

55955550 is an abundant number, since it is smaller than the sum of its proper divisors (112997922).

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

55955550 is a wasteful number, since it uses less digits than its factorization.

55955550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 140625, while the sum is 39.

The square root of 55955550 is about 7480.3442434155. The cubic root of 55955550 is about 382.4849838182.

The spelling of 55955550 in words is "fifty-five million, nine hundred fifty-five thousand, five hundred fifty".