55807207 has 4 divisors (see below), whose sum is σ = 56593296. Its totient is φ = 55021120.

The previous prime is 55807201. The next prime is 55807231. The reversal of 55807207 is 70270855.

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 55807207 - 2¹¹ = 55805159 is a prime.

It is a super-2 number, since 2×55807207² = 6228888706281698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55807201) 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, 392938 + ... + 393079.

It is an arithmetic number, because the mean of its divisors is an integer number (14148324).

Almost surely, 2^55807207 is an apocalyptic number.

55807207 is a deficient number, since it is larger than the sum of its proper divisors (786089).

55807207 is an equidigital number, since it uses as much as digits as its factorization.

55807207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786088.

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 55807207 is about 7470.4221433598. The cubic root of 55807207 is about 382.1466844365.

The spelling of 55807207 in words is "fifty-five million, eight hundred seven thousand, two hundred seven".