261352410 has 128 divisors (see below), whose sum is σ = 731427840. Its totient is φ = 59097600.

The previous prime is 261352393. The next prime is 261352451. The reversal of 261352410 is 14253162.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 457425 + ... + 457995.

It is an arithmetic number, because the mean of its divisors is an integer number (5714280).

Almost surely, 2^261352410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261352410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365713920).

261352410 is an abundant number, since it is smaller than the sum of its proper divisors (470075430).

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

261352410 is a wasteful number, since it uses less digits than its factorization.

261352410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 261352410 is about 16166.3975578977. The cubic root of 261352410 is about 639.3551528962.

The spelling of 261352410 in words is "two hundred sixty-one million, three hundred fifty-two thousand, four hundred ten".