261790366 has 8 divisors (see below), whose sum is σ = 406226520. Its totient is φ = 126381528.

The previous prime is 261790363. The next prime is 261790409. The reversal of 261790366 is 663097162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261790363) 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 3 ways as a sum of consecutive naturals, for example, 2256756 + ... + 2256871.

It is an arithmetic number, because the mean of its divisors is an integer number (50778315).

Almost surely, 2^261790366 is an apocalyptic number.

261790366 is a deficient number, since it is larger than the sum of its proper divisors (144436154).

261790366 is a wasteful number, since it uses less digits than its factorization.

261790366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513658.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 261790366 is about 16179.9371445009. The cubic root of 261790366 is about 639.7120824076.

The spelling of 261790366 in words is "two hundred sixty-one million, seven hundred ninety thousand, three hundred sixty-six".