260661720 has 128 divisors (see below), whose sum is σ = 858574080. Its totient is φ = 62784000.

The previous prime is 260661719. The next prime is 260661721. The reversal of 260661720 is 27166062.

260661720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (260661719) and next prime (260661721).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260661721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 238375 + ... + 239465.

It is an arithmetic number, because the mean of its divisors is an integer number (6707610).

Almost surely, 2^260661720 is an apocalyptic number.

260661720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 260661720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (429287040).

260661720 is an abundant number, since it is smaller than the sum of its proper divisors (597912360).

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

260661720 is a wasteful number, since it uses less digits than its factorization.

260661720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1293 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 260661720 is about 16145.0215236772. The cubic root of 260661720 is about 638.7914366574.

The spelling of 260661720 in words is "two hundred sixty million, six hundred sixty-one thousand, seven hundred twenty".