55649328 has 160 divisors (see below), whose sum is σ = 180940800. Its totient is φ = 14370048.

The previous prime is 55649327. The next prime is 55649339. The reversal of 55649328 is 82394655.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 55649328.

It is not an unprimeable number, because it can be changed into a prime (55649323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146643 + ... + 147021.

It is an arithmetic number, because the mean of its divisors is an integer number (1130880).

Almost surely, 2^55649328 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 55649328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90470400).

55649328 is an abundant number, since it is smaller than the sum of its proper divisors (125291472).

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

55649328 is a wasteful number, since it uses less digits than its factorization.

55649328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 433 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 55649328 is about 7459.8477196254. The cubic root of 55649328 is about 381.7859788136.

The spelling of 55649328 in words is "fifty-five million, six hundred forty-nine thousand, three hundred twenty-eight".