32778261 has 12 divisors (see below), whose sum is σ = 50131692. Its totient is φ = 20566656.

The previous prime is 32778247. The next prime is 32778269. The reversal of 32778261 is 16287723.

32778261 is a `hidden beast` number, since 327 + 78 + 261 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20875761 + 11902500 = 4569^2 + 3450^2 .

It is not a de Polignac number, because 32778261 - 2⁹ = 32777749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32778269) 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 11 ways as a sum of consecutive naturals, for example, 106966 + ... + 107271.

It is an arithmetic number, because the mean of its divisors is an integer number (4177641).

Almost surely, 2^32778261 is an apocalyptic number.

It is an amenable number.

32778261 is a deficient number, since it is larger than the sum of its proper divisors (17353431).

32778261 is a wasteful number, since it uses less digits than its factorization.

32778261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214260 (or 214257 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 32778261 is about 5725.2302137119. The cubic root of 32778261 is about 320.0333982068.

The spelling of 32778261 in words is "thirty-two million, seven hundred seventy-eight thousand, two hundred sixty-one".