55807879 has 2 divisors, whose sum is σ = 55807880. Its totient is φ = 55807878.

The previous prime is 55807841. The next prime is 55807903. The reversal of 55807879 is 97870855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55807879 - 2⁷ = 55807751 is a prime.

It is a super-2 number, since 2×55807879² = 6229038716957282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55807819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27903939 + 27903940.

It is an arithmetic number, because the mean of its divisors is an integer number (27903940).

Almost surely, 2^55807879 is an apocalyptic number.

55807879 is a deficient number, since it is larger than the sum of its proper divisors (1).

55807879 is an equidigital number, since it uses as much as digits as its factorization.

55807879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 55807879 is about 7470.4671206023. The cubic root of 55807879 is about 382.1482182978.

The spelling of 55807879 in words is "fifty-five million, eight hundred seven thousand, eight hundred seventy-nine".