55721258 has 8 divisors (see below), whose sum is σ = 83615652. Its totient is φ = 27849376.

The previous prime is 55721231. The next prime is 55721261. The reversal of 55721258 is 85212755.

55721258 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 53684929 + 2036329 = 7327^2 + 1427^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 3566 + ... + 11142.

Almost surely, 2^55721258 is an apocalyptic number.

55721258 is a deficient number, since it is larger than the sum of its proper divisors (27894394).

55721258 is a wasteful number, since it uses less digits than its factorization.

55721258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11256.

The product of its digits is 28000, while the sum is 35.

The square root of 55721258 is about 7464.6673067190. The cubic root of 55721258 is about 381.9504015354.

The spelling of 55721258 in words is "fifty-five million, seven hundred twenty-one thousand, two hundred fifty-eight".