261463568 has 20 divisors (see below), whose sum is σ = 514892268. Its totient is φ = 128588160.

The previous prime is 261463567. The next prime is 261463583. The reversal of 261463568 is 865364162.

261463568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 92775424 + 168688144 = 9632^2 + 12988^2 .

It is not an unprimeable number, because it can be changed into a prime (261463567) 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, 132971 + ... + 134922.

Almost surely, 2^261463568 is an apocalyptic number.

It is an amenable number.

261463568 is a deficient number, since it is larger than the sum of its proper divisors (253428700).

261463568 is a wasteful number, since it uses less digits than its factorization.

261463568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267962 (or 267956 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 261463568 is about 16169.8351259374. The cubic root of 261463568 is about 639.4457832278.

The spelling of 261463568 in words is "two hundred sixty-one million, four hundred sixty-three thousand, five hundred sixty-eight".