55807287 has 4 divisors (see below), whose sum is σ = 74409720. Its totient is φ = 37204856.

The previous prime is 55807231. The next prime is 55807303. The reversal of 55807287 is 78270855.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 55807287 - 2⁷ = 55807159 is a prime.

It is a super-2 number, since 2×55807287² = 6228906564600738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55807387) 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, 9301212 + ... + 9301217.

It is an arithmetic number, because the mean of its divisors is an integer number (18602430).

Almost surely, 2^55807287 is an apocalyptic number.

55807287 is a deficient number, since it is larger than the sum of its proper divisors (18602433).

55807287 is a wasteful number, since it uses less digits than its factorization.

55807287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18602432.

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 55807287 is about 7470.4274978076. The cubic root of 55807287 is about 382.1468670397.

The spelling of 55807287 in words is "fifty-five million, eight hundred seven thousand, two hundred eighty-seven".