261806260 has 24 divisors (see below), whose sum is σ = 550793376. Its totient is φ = 104532000.

The previous prime is 261806221. The next prime is 261806267. The reversal of 261806260 is 62608162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261806267) 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, 366 + ... + 22885.

It is an arithmetic number, because the mean of its divisors is an integer number (22949724).

Almost surely, 2^261806260 is an apocalyptic number.

261806260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261806260 is an abundant number, since it is smaller than the sum of its proper divisors (288987116).

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

261806260 is a wasteful number, since it uses less digits than its factorization.

261806260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23823 (or 23821 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 261806260 is about 16180.4283008825. The cubic root of 261806260 is about 639.7250283616.

The spelling of 261806260 in words is "two hundred sixty-one million, eight hundred six thousand, two hundred sixty".