55331328 has 160 divisors (see below), whose sum is σ = 169114176. Its totient is φ = 15925248.

The previous prime is 55331327. The next prime is 55331351. The reversal of 55331328 is 82313355.

It is a junction number, because it is equal to n+sod(n) for n = 55331295 and 55331304.

It is not an unprimeable number, because it can be changed into a prime (55331327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339375 + ... + 339537.

Almost surely, 2^55331328 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 55331328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84557088).

55331328 is an abundant number, since it is smaller than the sum of its proper divisors (113782848).

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

55331328 is a wasteful number, since it uses less digits than its factorization.

55331328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 198 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 55331328 is about 7438.5030752161. The cubic root of 55331328 is about 381.0573690315.

The spelling of 55331328 in words is "fifty-five million, three hundred thirty-one thousand, three hundred twenty-eight".