261745730 has 32 divisors (see below), whose sum is σ = 485996544. Its totient is φ = 101437056.

The previous prime is 261745721. The next prime is 261745739. The reversal of 261745730 is 37547162.

It is an interprime number because it is at equal distance from previous prime (261745721) and next prime (261745739).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261745739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52214 + ... + 57006.

It is an arithmetic number, because the mean of its divisors is an integer number (15187392).

Almost surely, 2^261745730 is an apocalyptic number.

261745730 is a deficient number, since it is larger than the sum of its proper divisors (224250814).

261745730 is a wasteful number, since it uses less digits than its factorization.

261745730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4970.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 261745730 is about 16178.5577231099. The cubic root of 261745730 is about 639.6757227662.

The spelling of 261745730 in words is "two hundred sixty-one million, seven hundred forty-five thousand, seven hundred thirty".