61784345 has 12 divisors (see below), whose sum is σ = 86246244. Its totient is φ = 42366240.

The previous prime is 61784323. The next prime is 61784347. The reversal of 61784345 is 54348716.

61784345 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 8479744 + 53304601 = 2912^2 + 7301^2 .

It is not a de Polignac number, because 61784345 - 2¹² = 61780249 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61784299 and 61784308.

It is not an unprimeable number, because it can be changed into a prime (61784347) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 125846 + ... + 126335.

It is an arithmetic number, because the mean of its divisors is an integer number (7187187).

Almost surely, 2^61784345 is an apocalyptic number.

It is an amenable number.

61784345 is a deficient number, since it is larger than the sum of its proper divisors (24461899).

61784345 is a wasteful number, since it uses less digits than its factorization.

61784345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252200 (or 252193 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 61784345 is about 7860.3018389881. The cubic root of 61784345 is about 395.3297358845.

The spelling of 61784345 in words is "sixty-one million, seven hundred eighty-four thousand, three hundred forty-five".