55215252 has 72 divisors (see below), whose sum is σ = 149700096. Its totient is φ = 17097984.

The previous prime is 55215239. The next prime is 55215263. The reversal of 55215252 is 25251255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50253 + ... + 51339.

It is an arithmetic number, because the mean of its divisors is an integer number (2079168).

Almost surely, 2^55215252 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 55215252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74850048).

55215252 is an abundant number, since it is smaller than the sum of its proper divisors (94484844).

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

55215252 is a wasteful number, since it uses less digits than its factorization.

55215252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1192 counting only the distinct ones).

The product of its digits is 5000, while the sum is 27.

The square root of 55215252 is about 7430.6966026073. The cubic root of 55215252 is about 380.7907173107.

The spelling of 55215252 in words is "fifty-five million, two hundred fifteen thousand, two hundred fifty-two".