258687261 has 24 divisors (see below), whose sum is σ = 449517120. Its totient is φ = 140040576.

The previous prime is 258687257. The next prime is 258687277. The reversal of 258687261 is 162786852.

258687261 is a `hidden beast` number, since 2 + 586 + 8 + 7 + 2 + 61 = 666.

It is not a de Polignac number, because 258687261 - 2² = 258687257 is a prime.

It is a super-3 number, since 3×258687261³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258687241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106860 + ... + 109253.

It is an arithmetic number, because the mean of its divisors is an integer number (18729880).

Almost surely, 2^258687261 is an apocalyptic number.

258687261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

258687261 is a deficient number, since it is larger than the sum of its proper divisors (190829859).

258687261 is a wasteful number, since it uses less digits than its factorization.

258687261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216145 (or 216142 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 258687261 is about 16083.7576766128. The cubic root of 258687261 is about 637.1744423081.

The spelling of 258687261 in words is "two hundred fifty-eight million, six hundred eighty-seven thousand, two hundred sixty-one".