55028728 has 32 divisors (see below), whose sum is σ = 111585600. Its totient is φ = 25341952.

The previous prime is 55028713. The next prime is 55028749. The reversal of 55028728 is 82782055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2088 + ... + 10696.

It is an arithmetic number, because the mean of its divisors is an integer number (3487050).

Almost surely, 2^55028728 is an apocalyptic number.

It is an amenable number.

55028728 is an abundant number, since it is smaller than the sum of its proper divisors (56556872).

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

55028728 is a wasteful number, since it uses less digits than its factorization.

55028728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8679 (or 8675 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 55028728 is about 7418.1350756103. The cubic root of 55028728 is about 380.3614474108.

The spelling of 55028728 in words is "fifty-five million, twenty-eight thousand, seven hundred twenty-eight".