55028807 has 4 divisors (see below), whose sum is σ = 57925080. Its totient is φ = 52132536.

The previous prime is 55028797. The next prime is 55028821. The reversal of 55028807 is 70882055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70882055 = 5 ⋅14176411.

It is a cyclic number.

It is not a de Polignac number, because 55028807 - 2⁴ = 55028791 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 (55028867) 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, 1448108 + ... + 1448145.

It is an arithmetic number, because the mean of its divisors is an integer number (14481270).

Almost surely, 2^55028807 is an apocalyptic number.

55028807 is a deficient number, since it is larger than the sum of its proper divisors (2896273).

55028807 is a wasteful number, since it uses less digits than its factorization.

55028807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896272.

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

The square root of 55028807 is about 7418.1404003969. The cubic root of 55028807 is about 380.3616294281.

The spelling of 55028807 in words is "fifty-five million, twenty-eight thousand, eight hundred seven".