261328370 has 8 divisors (see below), whose sum is σ = 470391084. Its totient is φ = 104531344.

The previous prime is 261328349. The next prime is 261328381. The reversal of 261328370 is 73823162.

It is a happy number.

261328370 is digitally balanced in base 3, 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 237190801 + 24137569 = 15401^2 + 4913^2 .

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

It is an unprimeable number.

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, 13066409 + ... + 13066428.

Almost surely, 2^261328370 is an apocalyptic number.

261328370 is a deficient number, since it is larger than the sum of its proper divisors (209062714).

261328370 is a wasteful number, since it uses less digits than its factorization.

261328370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26132844.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 261328370 is about 16165.6540232680. The cubic root of 261328370 is about 639.3355490094.

The spelling of 261328370 in words is "two hundred sixty-one million, three hundred twenty-eight thousand, three hundred seventy".