55028987 has 4 divisors (see below), whose sum is σ = 59262000. Its totient is φ = 50795976.

The previous prime is 55028969. The next prime is 55028993. The reversal of 55028987 is 78982055.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55028987 - 2¹² = 55024891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55028947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2116487 + ... + 2116512.

It is an arithmetic number, because the mean of its divisors is an integer number (14815500).

Almost surely, 2^55028987 is an apocalyptic number.

55028987 is a deficient number, since it is larger than the sum of its proper divisors (4233013).

55028987 is a wasteful number, since it uses less digits than its factorization.

55028987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4233012.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 55028987 is about 7418.1525328076. The cubic root of 55028987 is about 380.3620441504.

The spelling of 55028987 in words is "fifty-five million, twenty-eight thousand, nine hundred eighty-seven".