55275815 has 16 divisors (see below), whose sum is σ = 76316160. Its totient is φ = 37648800.

The previous prime is 55275811. The next prime is 55275833. The reversal of 55275815 is 51857255.

It is not a de Polignac number, because 55275815 - 2² = 55275811 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55275811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56 + ... + 10514.

It is an arithmetic number, because the mean of its divisors is an integer number (4769760).

Almost surely, 2^55275815 is an apocalyptic number.

55275815 is a deficient number, since it is larger than the sum of its proper divisors (21040345).

55275815 is a wasteful number, since it uses less digits than its factorization.

55275815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10622.

The product of its digits is 70000, while the sum is 38.

The square root of 55275815 is about 7434.7706756833. The cubic root of 55275815 is about 380.9298902186.

It can be divided in two parts, 552 and 75815, that added together give a palindrome (76367).

The spelling of 55275815 in words is "fifty-five million, two hundred seventy-five thousand, eight hundred fifteen".