261567670 has 32 divisors (see below), whose sum is σ = 579475008. Its totient is φ = 82781568.

The previous prime is 261567653. The next prime is 261567697. The reversal of 261567670 is 76765162.

It is a happy number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 142809 + ... + 144628.

It is an arithmetic number, because the mean of its divisors is an integer number (18108594).

Almost surely, 2^261567670 is an apocalyptic number.

261567670 is an abundant number, since it is smaller than the sum of its proper divisors (317907338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261567670 is a wasteful number, since it uses less digits than its factorization.

261567670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287464.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 261567670 is about 16173.0538241855. The cubic root of 261567670 is about 639.5306373086.

The spelling of 261567670 in words is "two hundred sixty-one million, five hundred sixty-seven thousand, six hundred seventy".