55736309 has 4 divisors (see below), whose sum is σ = 55879980. Its totient is φ = 55592640.

The previous prime is 55736293. The next prime is 55736321. The reversal of 55736309 is 90363755.

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 24039409 + 31696900 = 4903^2 + 5630^2 .

It is a cyclic number.

It is not a de Polignac number, because 55736309 - 2⁴ = 55736293 is a prime.

It is a super-2 number, since 2×55736309² = 6213072281886962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55736389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71252 + ... + 72029.

It is an arithmetic number, because the mean of its divisors is an integer number (13969995).

Almost surely, 2^55736309 is an apocalyptic number.

It is an amenable number.

55736309 is a deficient number, since it is larger than the sum of its proper divisors (143671).

55736309 is a wasteful number, since it uses less digits than its factorization.

55736309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143670.

The product of its (nonzero) digits is 85050, while the sum is 38.

The square root of 55736309 is about 7465.6753880677. The cubic root of 55736309 is about 381.9847882798.

The spelling of 55736309 in words is "fifty-five million, seven hundred thirty-six thousand, three hundred nine".