55220765 has 8 divisors (see below), whose sum is σ = 68402688. Its totient is φ = 42751440.

The previous prime is 55220749. The next prime is 55220771. The reversal of 55220765 is 56702255.

55220765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55220765 - 2⁴ = 55220749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177977 + ... + 178286.

It is an arithmetic number, because the mean of its divisors is an integer number (8550336).

Almost surely, 2^55220765 is an apocalyptic number.

It is an amenable number.

55220765 is a deficient number, since it is larger than the sum of its proper divisors (13181923).

55220765 is a wasteful number, since it uses less digits than its factorization.

55220765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356299.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 55220765 is about 7431.0675545308. The cubic root of 55220765 is about 380.8033903149.

The spelling of 55220765 in words is "fifty-five million, two hundred twenty thousand, seven hundred sixty-five".