258661287 has 12 divisors (see below), whose sum is σ = 374283624. Its totient is φ = 172135440.

The previous prime is 258661259. The next prime is 258661309. The reversal of 258661287 is 782166852.

258661287 is a `hidden beast` number, since 2 + 586 + 61 + 2 + 8 + 7 = 666.

It is not a de Polignac number, because 258661287 - 2⁶ = 258661223 is a prime.

It is a super-2 number, since 2×258661287² = 133811322784992738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258661187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20028 + ... + 30305.

It is an arithmetic number, because the mean of its divisors is an integer number (31190302).

Almost surely, 2^258661287 is an apocalyptic number.

258661287 is a deficient number, since it is larger than the sum of its proper divisors (115622337).

258661287 is a wasteful number, since it uses less digits than its factorization.

258661287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50910 (or 50907 counting only the distinct ones).

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

The square root of 258661287 is about 16082.9501957819. The cubic root of 258661287 is about 637.1531160126.

The spelling of 258661287 in words is "two hundred fifty-eight million, six hundred sixty-one thousand, two hundred eighty-seven".