261724130 has 32 divisors (see below), whose sum is σ = 508550400. Its totient is φ = 96682432.

The previous prime is 261724109. The next prime is 261724147. The reversal of 261724130 is 31427162.

It is a super-3 number, since 3×261724130³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261724130.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12950 + ... + 26289.

It is an arithmetic number, because the mean of its divisors is an integer number (15892200).

Almost surely, 2^261724130 is an apocalyptic number.

261724130 is a deficient number, since it is larger than the sum of its proper divisors (246826270).

261724130 is a wasteful number, since it uses less digits than its factorization.

261724130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39298.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 261724130 is about 16177.8901591029. The cubic root of 261724130 is about 639.6581263305.

The spelling of 261724130 in words is "two hundred sixty-one million, seven hundred twenty-four thousand, one hundred thirty".