261620770 has 8 divisors (see below), whose sum is σ = 470917404. Its totient is φ = 104648304.

The previous prime is 261620761. The next prime is 261620797. The reversal of 261620770 is 77026162.

It can be written as a sum of positive squares in 2 ways, for example, as 259177801 + 2442969 = 16099^2 + 1563^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13081029 + ... + 13081048.

Almost surely, 2^261620770 is an apocalyptic number.

261620770 is a deficient number, since it is larger than the sum of its proper divisors (209296634).

261620770 is a wasteful number, since it uses less digits than its factorization.

261620770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26162084.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 261620770 is about 16174.6953603460. The cubic root of 261620770 is about 639.5739107238.

The spelling of 261620770 in words is "two hundred sixty-one million, six hundred twenty thousand, seven hundred seventy".