261038578 has 8 divisors (see below), whose sum is σ = 391642668. Its totient is φ = 130491024.

The previous prime is 261038563. The next prime is 261038623. The reversal of 261038578 is 875830162.

It can be written as a sum of positive squares in 2 ways, for example, as 256864729 + 4173849 = 16027^2 + 2043^2 .

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

It is a super-2 number, since 2×261038578² = 136282278408524168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261038578.

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, 400 + ... + 22852.

Almost surely, 2^261038578 is an apocalyptic number.

261038578 is a deficient number, since it is larger than the sum of its proper divisors (130604090).

261038578 is a wasteful number, since it uses less digits than its factorization.

261038578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28268.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 261038578 is about 16156.6883364135. The cubic root of 261038578 is about 639.0991378174.

The spelling of 261038578 in words is "two hundred sixty-one million, thirty-eight thousand, five hundred seventy-eight".