261867432 has 16 divisors (see below), whose sum is σ = 654668640. Its totient is φ = 87289136.

The previous prime is 261867421. The next prime is 261867433. The reversal of 261867432 is 234768162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261867433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5455548 + ... + 5455595.

It is an arithmetic number, because the mean of its divisors is an integer number (40916790).

Almost surely, 2^261867432 is an apocalyptic number.

It is an amenable number.

261867432 is an abundant number, since it is smaller than the sum of its proper divisors (392801208).

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

261867432 is a wasteful number, since it uses less digits than its factorization.

261867432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10911152 (or 10911148 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 261867432 is about 16182.3184989049. The cubic root of 261867432 is about 639.7748491871.

The spelling of 261867432 in words is "two hundred sixty-one million, eight hundred sixty-seven thousand, four hundred thirty-two".