55281787 has 4 divisors (see below), whose sum is σ = 60307416. Its totient is φ = 50256160.

The previous prime is 55281781. The next prime is 55281803. The reversal of 55281787 is 78718255.

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 55281787 - 2¹⁹ = 54757499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55281781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2512798 + ... + 2512819.

It is an arithmetic number, because the mean of its divisors is an integer number (15076854).

Almost surely, 2^55281787 is an apocalyptic number.

55281787 is a deficient number, since it is larger than the sum of its proper divisors (5025629).

55281787 is a wasteful number, since it uses less digits than its factorization.

55281787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5025628.

The product of its digits is 156800, while the sum is 43.

The square root of 55281787 is about 7435.1722912115. The cubic root of 55281787 is about 380.9436082819.

The spelling of 55281787 in words is "fifty-five million, two hundred eighty-one thousand, seven hundred eighty-seven".