55782111 has 32 divisors (see below), whose sum is σ = 93593088. Its totient is φ = 28707840.

The previous prime is 55782071. The next prime is 55782127. The reversal of 55782111 is 11128755.

It is not a de Polignac number, because 55782111 - 2¹⁹ = 55257823 is a prime.

It is a super-2 number, since 2×55782111² = 6223287815232642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55782161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25035 + ... + 27171.

It is an arithmetic number, because the mean of its divisors is an integer number (2924784).

Almost surely, 2^55782111 is an apocalyptic number.

55782111 is a deficient number, since it is larger than the sum of its proper divisors (37810977).

55782111 is a wasteful number, since it uses less digits than its factorization.

55782111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271.

The product of its digits is 2800, while the sum is 30.

The square root of 55782111 is about 7468.7422635943. The cubic root of 55782111 is about 382.0893932034.

The spelling of 55782111 in words is "fifty-five million, seven hundred eighty-two thousand, one hundred eleven".