55781258 has 8 divisors (see below), whose sum is σ = 90108228. Its totient is φ = 25745184.

The previous prime is 55781249. The next prime is 55781261. The reversal of 55781258 is 85218755.

55781258 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 53479969 + 2301289 = 7313^2 + 1517^2 .

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

It is a super-2 number, since 2×55781258² = 6223097488125128, which contains 22 as substring.

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, 1072691 + ... + 1072742.

Almost surely, 2^55781258 is an apocalyptic number.

55781258 is a deficient number, since it is larger than the sum of its proper divisors (34326970).

55781258 is a wasteful number, since it uses less digits than its factorization.

55781258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145448.

The product of its digits is 112000, while the sum is 41.

The square root of 55781258 is about 7468.6851587144. The cubic root of 55781258 is about 382.0874456022.

The spelling of 55781258 in words is "fifty-five million, seven hundred eighty-one thousand, two hundred fifty-eight".