261605432 has 16 divisors (see below), whose sum is σ = 535102200. Its totient is φ = 118911520.

The previous prime is 261605417. The next prime is 261605437. The reversal of 261605432 is 234506162.

It is a junction number, because it is equal to n+sod(n) for n = 261605395 and 261605404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261605437) 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, 1486307 + ... + 1486482.

Almost surely, 2^261605432 is an apocalyptic number.

261605432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261605432 is an abundant number, since it is smaller than the sum of its proper divisors (273496768).

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

261605432 is a wasteful number, since it uses less digits than its factorization.

261605432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972806 (or 2972802 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 261605432 is about 16174.2212177279. The cubic root of 261605432 is about 639.5614117463.

The spelling of 261605432 in words is "two hundred sixty-one million, six hundred five thousand, four hundred thirty-two".