55782145 has 4 divisors (see below), whose sum is σ = 66938580. Its totient is φ = 44625712.

The previous prime is 55782143. The next prime is 55782149. The reversal of 55782145 is 54128755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54128755 = 5 ⋅10825751.

It can be written as a sum of positive squares in 2 ways, for example, as 8020224 + 47761921 = 2832^2 + 6911^2 .

It is a cyclic number.

It is not a de Polignac number, because 55782145 - 2¹ = 55782143 is a prime.

It is a super-2 number, since 2×55782145² = 6223295401602050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55782143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5578210 + ... + 5578219.

It is an arithmetic number, because the mean of its divisors is an integer number (16734645).

Almost surely, 2^55782145 is an apocalyptic number.

It is an amenable number.

55782145 is a deficient number, since it is larger than the sum of its proper divisors (11156435).

55782145 is a wasteful number, since it uses less digits than its factorization.

55782145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11156434.

The product of its digits is 56000, while the sum is 37.

The square root of 55782145 is about 7468.7445397470. The cubic root of 55782145 is about 382.0894708330.

The spelling of 55782145 in words is "fifty-five million, seven hundred eighty-two thousand, one hundred forty-five".