55728444 has 24 divisors (see below), whose sum is σ = 136877440. Its totient is φ = 17598384.

The previous prime is 55728437. The next prime is 55728451. The reversal of 55728444 is 44482755.

55728444 is digitally balanced in base 2 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55728437) and next prime (55728451).

It is a super-2 number, since 2×55728444² = 6211318941322272, which contains 22 as substring.

55728444 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121984 + ... + 122439.

Almost surely, 2^55728444 is an apocalyptic number.

It is an amenable number.

55728444 is an abundant number, since it is smaller than the sum of its proper divisors (81148996).

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

55728444 is a wasteful number, since it uses less digits than its factorization.

55728444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244449 (or 244447 counting only the distinct ones).

The product of its digits is 179200, while the sum is 39.

The square root of 55728444 is about 7465.1486254461. The cubic root of 55728444 is about 381.9668200305.

The spelling of 55728444 in words is "fifty-five million, seven hundred twenty-eight thousand, four hundred forty-four".