258609805 has 8 divisors (see below), whose sum is σ = 315419544. Its totient is φ = 203496000.

The previous prime is 258609773. The next prime is 258609809. The reversal of 258609805 is 508906852.

258609805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10673289 + 247936516 = 3267^2 + 15746^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 258609805 - 2⁵ = 258609773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258609809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423646 + ... + 424255.

It is an arithmetic number, because the mean of its divisors is an integer number (39427443).

Almost surely, 2^258609805 is an apocalyptic number.

It is an amenable number.

258609805 is a deficient number, since it is larger than the sum of its proper divisors (56809739).

258609805 is an equidigital number, since it uses as much as digits as its factorization.

258609805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847967.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 258609805 is about 16081.3496013239. The cubic root of 258609805 is about 637.1108418174.

The spelling of 258609805 in words is "two hundred fifty-eight million, six hundred nine thousand, eight hundred five".