261456770 has 64 divisors (see below), whose sum is σ = 521427456. Its totient is φ = 93972480.

The previous prime is 261456761. The next prime is 261456773. The reversal of 261456770 is 77654162.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261456773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 343190 + ... + 343950.

It is an arithmetic number, because the mean of its divisors is an integer number (8147304).

Almost surely, 2^261456770 is an apocalyptic number.

261456770 is a deficient number, since it is larger than the sum of its proper divisors (259970686).

261456770 is a wasteful number, since it uses less digits than its factorization.

261456770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 261456770 is about 16169.6249183461. The cubic root of 261456770 is about 639.4402413593.

The spelling of 261456770 in words is "two hundred sixty-one million, four hundred fifty-six thousand, seven hundred seventy".