261570894 has 32 divisors (see below), whose sum is σ = 582815520. Its totient is φ = 77707392.

The previous prime is 261570821. The next prime is 261570913. The reversal of 261570894 is 498075162.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55557 + ... + 60080.

It is an arithmetic number, because the mean of its divisors is an integer number (18212985).

Almost surely, 2^261570894 is an apocalyptic number.

261570894 is an abundant number, since it is smaller than the sum of its proper divisors (321244626).

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

261570894 is a wasteful number, since it uses less digits than its factorization.

261570894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115684.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 261570894 is about 16173.1534958400. The cubic root of 261570894 is about 639.5332648483.

The spelling of 261570894 in words is "two hundred sixty-one million, five hundred seventy thousand, eight hundred ninety-four".