55728028 has 6 divisors (see below), whose sum is σ = 97524056. Its totient is φ = 27864012.

The previous prime is 55728017. The next prime is 55728059. The reversal of 55728028 is 82082755.

It is a super-2 number, since 2×55728028² = 6211226209537568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6966000 + ... + 6966007.

Almost surely, 2^55728028 is an apocalyptic number.

It is an amenable number.

55728028 is a deficient number, since it is larger than the sum of its proper divisors (41796028).

55728028 is a wasteful number, since it uses less digits than its factorization.

55728028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13932011 (or 13932009 counting only the distinct ones).

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

The square root of 55728028 is about 7465.1207625865. The cubic root of 55728028 is about 381.9658695967.

The spelling of 55728028 in words is "fifty-five million, seven hundred twenty-eight thousand, twenty-eight".