261823880 has 32 divisors (see below), whose sum is σ = 590509440. Its totient is φ = 104479680.

The previous prime is 261823879. The next prime is 261823889. The reversal of 261823880 is 88328162.

It is not an unprimeable number, because it can be changed into a prime (261823889) 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, 9647 + ... + 24833.

It is an arithmetic number, because the mean of its divisors is an integer number (18453420).

Almost surely, 2^261823880 is an apocalyptic number.

261823880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261823880 is an abundant number, since it is smaller than the sum of its proper divisors (328685560).

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

261823880 is a wasteful number, since it uses less digits than its factorization.

261823880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15629 (or 15625 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 261823880 is about 16180.9727766905. The cubic root of 261823880 is about 639.7393795618.

The spelling of 261823880 in words is "two hundred sixty-one million, eight hundred twenty-three thousand, eight hundred eighty".