55215552 has 84 divisors (see below), whose sum is σ = 169971720. Its totient is φ = 15773184.

The previous prime is 55215551. The next prime is 55215599. The reversal of 55215552 is 25551255.

It is a tau number, because it is divible by the number of its divisors (84).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55215551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6474 + ... + 12342.

Almost surely, 2^55215552 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 55215552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84985860).

55215552 is an abundant number, since it is smaller than the sum of its proper divisors (114756168).

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

55215552 is a wasteful number, since it uses less digits than its factorization.

55215552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5898 (or 5881 counting only the distinct ones).

The product of its digits is 12500, while the sum is 30.

The square root of 55215552 is about 7430.7167891126. The cubic root of 55215552 is about 380.7914069572.

The spelling of 55215552 in words is "fifty-five million, two hundred fifteen thousand, five hundred fifty-two".