55173312 has 140 divisors (see below), whose sum is σ = 169651680. Its totient is φ = 17708544.

The previous prime is 55173299. The next prime is 55173323. The reversal of 55173312 is 21337155.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 150153 + ... + 150519.

Almost surely, 2^55173312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55173312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84825840).

55173312 is an abundant number, since it is smaller than the sum of its proper divisors (114478368).

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

55173312 is a wasteful number, since it uses less digits than its factorization.

55173312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 401 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 55173312 is about 7427.8739892381. The cubic root of 55173312 is about 380.6942801407.

The spelling of 55173312 in words is "fifty-five million, one hundred seventy-three thousand, three hundred twelve".