55280087 has 4 divisors (see below), whose sum is σ = 55348080. Its totient is φ = 55212096.

The previous prime is 55280077. The next prime is 55280117. The reversal of 55280087 is 78008255.

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 55280087 - 2⁶ = 55280023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55280047) 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, 32762 + ... + 34407.

It is an arithmetic number, because the mean of its divisors is an integer number (13837020).

Almost surely, 2^55280087 is an apocalyptic number.

55280087 is a deficient number, since it is larger than the sum of its proper divisors (67993).

55280087 is an equidigital number, since it uses as much as digits as its factorization.

55280087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67992.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 55280087 is about 7435.0579688392. The cubic root of 55280087 is about 380.9397033745.

The spelling of 55280087 in words is "fifty-five million, two hundred eighty thousand, eighty-seven".