55457809 has 9 divisors (see below), whose sum is σ = 61047931. Its totient is φ = 50341720.

The previous prime is 55457777. The next prime is 55457813. The reversal of 55457809 is 90875455.

The square root of 55457809 is 7447.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 327184 = 7425^2 + 572^2 .

It is not a de Polignac number, because 55457809 - 2⁵ = 55457777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55457849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 81579 + ... + 82255.

Almost surely, 2^55457809 is an apocalyptic number.

55457809 is the 7447-th square number.

55457809 is the 3724-th centered octagonal number.

It is an amenable number.

55457809 is a deficient number, since it is larger than the sum of its proper divisors (5590122).

55457809 is an frugal number, since it uses more digits than its factorization.

55457809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 43.

The cubic root of 55457809 is about 381.3474990629.

The spelling of 55457809 in words is "fifty-five million, four hundred fifty-seven thousand, eight hundred nine".