55705709 has 4 divisors (see below), whose sum is σ = 55765116. Its totient is φ = 55646304.

The previous prime is 55705697. The next prime is 55705711. The reversal of 55705709 is 90750755.

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 9424900 + 46280809 = 3070^2 + 6803^2 .

It is a cyclic number.

It is not a de Polignac number, because 55705709 - 2²⁴ = 38928493 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 (55705409) 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, 28274 + ... + 30179.

It is an arithmetic number, because the mean of its divisors is an integer number (13941279).

Almost surely, 2^55705709 is an apocalyptic number.

It is an amenable number.

55705709 is a deficient number, since it is larger than the sum of its proper divisors (59407).

55705709 is an equidigital number, since it uses as much as digits as its factorization.

55705709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59406.

The product of its (nonzero) digits is 55125, while the sum is 38.

The square root of 55705709 is about 7463.6257274866. The cubic root of 55705709 is about 381.9148705160.

The spelling of 55705709 in words is "fifty-five million, seven hundred five thousand, seven hundred nine".