258605781 has 12 divisors (see below), whose sum is σ = 401103072. Its totient is φ = 147774648.

The previous prime is 258605761. The next prime is 258605801. The reversal of 258605781 is 187506852.

258605781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (258605761) and next prime (258605801).

It is not a de Polignac number, because 258605781 - 2¹⁰ = 258604757 is a prime.

It is a super-2 number, since 2×258605781² = 133753899933239922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258605761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 879465 + ... + 879758.

It is an arithmetic number, because the mean of its divisors is an integer number (33425256).

Almost surely, 2^258605781 is an apocalyptic number.

258605781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

258605781 is a deficient number, since it is larger than the sum of its proper divisors (142497291).

258605781 is a wasteful number, since it uses less digits than its factorization.

258605781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759240 (or 1759233 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 258605781 is about 16081.2244869599. The cubic root of 258605781 is about 637.1075372929.

The spelling of 258605781 in words is "two hundred fifty-eight million, six hundred five thousand, seven hundred eighty-one".