257820106 has 8 divisors (see below), whose sum is σ = 387170784. Its totient is φ = 128763180.

The previous prime is 257820071. The next prime is 257820109. The reversal of 257820106 is 601028752.

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

It is not an unprimeable number, because it can be changed into a prime (257820109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71230 + ... + 74761.

It is an arithmetic number, because the mean of its divisors is an integer number (48396348).

Almost surely, 2^257820106 is an apocalyptic number.

257820106 is a deficient number, since it is larger than the sum of its proper divisors (129350678).

257820106 is a wasteful number, since it uses less digits than its factorization.

257820106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146876.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 257820106 is about 16056.7775721033. Note that the first 3 decimals coincide. The cubic root of 257820106 is about 636.4616800614.

Adding to 257820106 its reverse (601028752), we get a palindrome (858848858).

The spelling of 257820106 in words is "two hundred fifty-seven million, eight hundred twenty thousand, one hundred six".