261745460 has 24 divisors (see below), whose sum is σ = 550788000. Its totient is φ = 104484384.

The previous prime is 261745453. The next prime is 261745499. The reversal of 261745460 is 64547162.

It is a super-2 number, since 2×261745460² = 137021371661223200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261745460.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3134 + ... + 23093.

It is an arithmetic number, because the mean of its divisors is an integer number (22949500).

Almost surely, 2^261745460 is an apocalyptic number.

261745460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261745460 is an abundant number, since it is smaller than the sum of its proper divisors (289042540).

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

261745460 is a wasteful number, since it uses less digits than its factorization.

261745460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26735 (or 26733 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 261745460 is about 16178.5493787298. The cubic root of 261745460 is about 639.6755028167.

The spelling of 261745460 in words is "two hundred sixty-one million, seven hundred forty-five thousand, four hundred sixty".