261748 has 6 divisors (see below), whose sum is σ = 458066. Its totient is φ = 130872.

The previous prime is 261739. The next prime is 261757. The reversal of 261748 is 847162.

It is an interprime number because it is at equal distance from previous prime (261739) and next prime (261757).

It can be written as a sum of positive squares in only one way, i.e., 209764 + 51984 = 458^2 + 228^2 .

It is a congruent number.

It is an unprimeable number.

261748 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32715 + ... + 32722.

2²⁶¹⁷⁴⁸ is an apocalyptic number.

It is an amenable number.

261748 is a deficient number, since it is larger than the sum of its proper divisors (196318).

261748 is a wasteful number, since it uses less digits than its factorization.

261748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65441 (or 65439 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 261748 is about 511.6131350933. The cubic root of 261748 is about 63.9677571965.

The spelling of 261748 in words is "two hundred sixty-one thousand, seven hundred forty-eight".