55117650 has 72 divisors (see below), whose sum is σ = 159030000. Its totient is φ = 12596640.

The previous prime is 55117649. The next prime is 55117687. The reversal of 55117650 is 5671155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3601 + ... + 11099.

It is an arithmetic number, because the mean of its divisors is an integer number (2208750).

Almost surely, 2^55117650 is an apocalyptic number.

55117650 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 55117650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79515000).

55117650 is an abundant number, since it is smaller than the sum of its proper divisors (103912350).

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

55117650 is a wasteful number, since it uses less digits than its factorization.

55117650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7528 (or 7516 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 30.

The square root of 55117650 is about 7424.1262112117. The cubic root of 55117650 is about 380.5662149934.

The spelling of 55117650 in words is "fifty-five million, one hundred seventeen thousand, six hundred fifty".