258241978 has 4 divisors (see below), whose sum is σ = 387362970. Its totient is φ = 129120988.

The previous prime is 258241969. The next prime is 258241979. The reversal of 258241978 is 879142852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 257698809 + 543169 = 16053^2 + 737^2 .

It is not an unprimeable number, because it can be changed into a prime (258241979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64560493 + ... + 64560496.

Almost surely, 2^258241978 is an apocalyptic number.

258241978 is a deficient number, since it is larger than the sum of its proper divisors (129120992).

258241978 is a wasteful number, since it uses less digits than its factorization.

258241978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129120991.

The product of its digits is 322560, while the sum is 46.

The square root of 258241978 is about 16069.9090849948. The cubic root of 258241978 is about 636.8086390928.

The spelling of 258241978 in words is "two hundred fifty-eight million, two hundred forty-one thousand, nine hundred seventy-eight".