261760860 has 72 divisors (see below), whose sum is σ = 810927936. Its totient is φ = 68315520.

The previous prime is 261760847. The next prime is 261760867. The reversal of 261760860 is 68067162.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261760867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7011 + ... + 23930.

It is an arithmetic number, because the mean of its divisors is an integer number (11262888).

Almost surely, 2^261760860 is an apocalyptic number.

261760860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261760860 is an abundant number, since it is smaller than the sum of its proper divisors (549167076).

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

261760860 is a wasteful number, since it uses less digits than its factorization.

261760860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31003 (or 30998 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 261760860 is about 16179.0253105680. The cubic root of 261760860 is about 639.6880478411.

The spelling of 261760860 in words is "two hundred sixty-one million, seven hundred sixty thousand, eight hundred sixty".