55657409 has 8 divisors (see below), whose sum is σ = 57830760. Its totient is φ = 53501056.

The previous prime is 55657391. The next prime is 55657451. The reversal of 55657409 is 90475655.

It can be written as a sum of positive squares in 4 ways, for example, as 5290000 + 50367409 = 2300^2 + 7097^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55657409 - 2⁸ = 55657153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55657489) 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 7 ways as a sum of consecutive naturals, for example, 2639 + ... + 10875.

It is an arithmetic number, because the mean of its divisors is an integer number (7228845).

Almost surely, 2^55657409 is an apocalyptic number.

It is an amenable number.

55657409 is a deficient number, since it is larger than the sum of its proper divisors (2173351).

55657409 is a wasteful number, since it uses less digits than its factorization.

55657409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8499.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 55657409 is about 7460.3893330040. The cubic root of 55657409 is about 381.8044580015.

The spelling of 55657409 in words is "fifty-five million, six hundred fifty-seven thousand, four hundred nine".