55502172 has 144 divisors (see below), whose sum is σ = 165110400. Its totient is φ = 16148160.

The previous prime is 55502147. The next prime is 55502177. The reversal of 55502172 is 27120555.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55502177) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 309979 + ... + 310157.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^55502172 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 55502172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82555200).

55502172 is an abundant number, since it is smaller than the sum of its proper divisors (109608228).

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

55502172 is a wasteful number, since it uses less digits than its factorization.

55502172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 55502172 is about 7449.9779865447. The cubic root of 55502172 is about 381.4491571843.

The spelling of 55502172 in words is "fifty-five million, five hundred two thousand, one hundred seventy-two".