261070260 has 192 divisors, whose sum is σ = 851558400. Its totient is φ = 59097600.

The previous prime is 261070259. The next prime is 261070283. The reversal of 261070260 is 62070162.

261070260 = 402² + 403² + ... + 946².

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 261070260.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1366765 + ... + 1366955.

It is an arithmetic number, because the mean of its divisors is an integer number (4435200).

Almost surely, 2^261070260 is an apocalyptic number.

261070260 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 261070260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425779200).

261070260 is an abundant number, since it is smaller than the sum of its proper divisors (590488140).

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

261070260 is a wasteful number, since it uses less digits than its factorization.

261070260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 261070260 is about 16157.6687674924. The cubic root of 261070260 is about 639.1249923864.

The spelling of 261070260 in words is "two hundred sixty-one million, seventy thousand, two hundred sixty".