261428 has 6 divisors (see below), whose sum is σ = 457506. Its totient is φ = 130712.

The previous prime is 261427. The next prime is 261431. The reversal of 261428 is 824162.

261428 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in only one way, i.e., 258064 + 3364 = 508^2 + 58^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261428.

It is not an unprimeable number, because it can be changed into a prime (261427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32675 + ... + 32682.

It is an arithmetic number, because the mean of its divisors is an integer number (76251).

2²⁶¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

261428 is a deficient number, since it is larger than the sum of its proper divisors (196078).

261428 is a wasteful number, since it uses less digits than its factorization.

261428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65361 (or 65359 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 261428 is about 511.3003031487. The cubic root of 261428 is about 63.9416786404.

It can be divided in two parts, 26 and 1428, that multiplied together give a triangular number (37128 = T₂₇₂).

The spelling of 261428 in words is "two hundred sixty-one thousand, four hundred twenty-eight".