55717550 has 24 divisors (see below), whose sum is σ = 118440336. Its totient is φ = 19103040.

The previous prime is 55717549. The next prime is 55717577. The reversal of 55717550 is 5571755.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55717550.

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, 79247 + ... + 79946.

It is an arithmetic number, because the mean of its divisors is an integer number (4935014).

Almost surely, 2^55717550 is an apocalyptic number.

55717550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55717550 is an abundant number, since it is smaller than the sum of its proper divisors (62722786).

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

55717550 is a wasteful number, since it uses less digits than its factorization.

55717550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159212 (or 159207 counting only the distinct ones).

The product of its (nonzero) digits is 30625, while the sum is 35.

The square root of 55717550 is about 7464.4189325091. The cubic root of 55717550 is about 381.9419289850.

The spelling of 55717550 in words is "fifty-five million, seven hundred seventeen thousand, five hundred fifty".