261620752 has 20 divisors (see below), whose sum is σ = 536707836. Its totient is φ = 123115520.

The previous prime is 261620743. The next prime is 261620759. The reversal of 261620752 is 257026162.

It can be written as a sum of positive squares in 2 ways, for example, as 189778176 + 71842576 = 13776^2 + 8476^2 .

It is not an unprimeable number, because it can be changed into a prime (261620759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480649 + ... + 481192.

Almost surely, 2^261620752 is an apocalyptic number.

It is an amenable number.

261620752 is an abundant number, since it is smaller than the sum of its proper divisors (275087084).

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

261620752 is a wasteful number, since it uses less digits than its factorization.

261620752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961866 (or 961860 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 261620752 is about 16174.6948039213. The cubic root of 261620752 is about 639.5738960558.

The spelling of 261620752 in words is "two hundred sixty-one million, six hundred twenty thousand, seven hundred fifty-two".