55572817 has 4 divisors (see below), whose sum is σ = 55978596. Its totient is φ = 55167040.

The previous prime is 55572809. The next prime is 55572823. The reversal of 55572817 is 71827555.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42497361 + 13075456 = 6519^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 55572817 - 2³ = 55572809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55572817.

It is not an unprimeable number, because it can be changed into a prime (55572827) 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, 202684 + ... + 202957.

It is an arithmetic number, because the mean of its divisors is an integer number (13994649).

Almost surely, 2^55572817 is an apocalyptic number.

It is an amenable number.

55572817 is a deficient number, since it is larger than the sum of its proper divisors (405779).

55572817 is a wasteful number, since it uses less digits than its factorization.

55572817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405778.

The product of its digits is 98000, while the sum is 40.

The square root of 55572817 is about 7454.7177679641. The cubic root of 55572817 is about 381.6109289348.

The spelling of 55572817 in words is "fifty-five million, five hundred seventy-two thousand, eight hundred seventeen".