1278126258 has 8 divisors (see below), whose sum is σ = 2556252528. Its totient is φ = 426042084.

The previous prime is 1278126253. The next prime is 1278126271. The reversal of 1278126258 is 8526218721.

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

1278126258 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1278126253) 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, 106510516 + ... + 106510527.

It is an arithmetic number, because the mean of its divisors is an integer number (319531566).

Almost surely, 2^1278126258 is an apocalyptic number.

1278126258 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278126258 is a wasteful number, since it uses less digits than its factorization.

1278126258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213021048.

The product of its digits is 107520, while the sum is 42.

The square root of 1278126258 is about 35750.8917091588. The cubic root of 1278126258 is about 1085.2369839188.

The spelling of 1278126258 in words is "one billion, two hundred seventy-eight million, one hundred twenty-six thousand, two hundred fifty-eight".