261174778 has 16 divisors (see below), whose sum is σ = 404787456. Its totient is φ = 126315280.

The previous prime is 261174773. The next prime is 261174811. The reversal of 261174778 is 877471162.

It is not an unprimeable number, because it can be changed into a prime (261174773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9826 + ... + 24877.

It is an arithmetic number, because the mean of its divisors is an integer number (25299216).

Almost surely, 2^261174778 is an apocalyptic number.

261174778 is a deficient number, since it is larger than the sum of its proper divisors (143612678).

261174778 is a wasteful number, since it uses less digits than its factorization.

261174778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34829.

The product of its digits is 131712, while the sum is 43.

The square root of 261174778 is about 16160.9027594377. The cubic root of 261174778 is about 639.2102710308.

The spelling of 261174778 in words is "two hundred sixty-one million, one hundred seventy-four thousand, seven hundred seventy-eight".