55981328 has 20 divisors (see below), whose sum is σ = 116807628. Its totient is φ = 25837440.

The previous prime is 55981327. The next prime is 55981337. The reversal of 55981328 is 82318955.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 45535504 = 3232^2 + 6748^2 .

It is not an unprimeable number, because it can be changed into a prime (55981327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134363 + ... + 134778.

Almost surely, 2^55981328 is an apocalyptic number.

It is an amenable number.

55981328 is an abundant number, since it is smaller than the sum of its proper divisors (60826300).

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

55981328 is a wasteful number, since it uses less digits than its factorization.

55981328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269162 (or 269156 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 55981328 is about 7482.0670940590. The cubic root of 55981328 is about 382.5437101002.

The spelling of 55981328 in words is "fifty-five million, nine hundred eighty-one thousand, three hundred twenty-eight".