261152240 has 20 divisors (see below), whose sum is σ = 607179144. Its totient is φ = 104460864.

The previous prime is 261152239. The next prime is 261152261. The reversal of 261152240 is 42251162.

It is a happy number.

261152240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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, 1632122 + ... + 1632281.

Almost surely, 2^261152240 is an apocalyptic number.

261152240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261152240 is an abundant number, since it is smaller than the sum of its proper divisors (346026904).

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

261152240 is a wasteful number, since it uses less digits than its factorization.

261152240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264416 (or 3264410 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 261152240 is about 16160.2054442386. The cubic root of 261152240 is about 639.1918836816.

The spelling of 261152240 in words is "two hundred sixty-one million, one hundred fifty-two thousand, two hundred forty".