261232840 has 32 divisors (see below), whose sum is σ = 641208960. Its totient is φ = 94993600.

The previous prime is 261232831. The next prime is 261232849. The reversal of 261232840 is 48232162.

It is an interprime number because it is at equal distance from previous prime (261232831) and next prime (261232849).

It is a junction number, because it is equal to n+sod(n) for n = 261232799 and 261232808.

It is not an unprimeable number, because it can be changed into a prime (261232849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296416 + ... + 297295.

It is an arithmetic number, because the mean of its divisors is an integer number (20037780).

Almost surely, 2^261232840 is an apocalyptic number.

261232840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261232840 is an abundant number, since it is smaller than the sum of its proper divisors (379976120).

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

261232840 is a wasteful number, since it uses less digits than its factorization.

261232840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593733 (or 593729 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 261232840 is about 16162.6990320305. The cubic root of 261232840 is about 639.2576353246.

The spelling of 261232840 in words is "two hundred sixty-one million, two hundred thirty-two thousand, eight hundred forty".