261441632 has 24 divisors (see below), whose sum is σ = 517035456. Its totient is φ = 130131072.

The previous prime is 261441619. The next prime is 261441637. The reversal of 261441632 is 236144162.

It is a junction number, because it is equal to n+sod(n) for n = 261441595 and 261441604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261441637) 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, 11183 + ... + 25454.

It is an arithmetic number, because the mean of its divisors is an integer number (21543144).

Almost surely, 2^261441632 is an apocalyptic number.

It is an amenable number.

261441632 is a deficient number, since it is larger than the sum of its proper divisors (255593824).

261441632 is a wasteful number, since it uses less digits than its factorization.

261441632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36870 (or 36862 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 261441632 is about 16169.1568116584. The cubic root of 261441632 is about 639.4279002073.

Adding to 261441632 its reverse (236144162), we get a palindrome (497585794).

The spelling of 261441632 in words is "two hundred sixty-one million, four hundred forty-one thousand, six hundred thirty-two".