1258717878 has 96 divisors (see below), whose sum is σ = 3039828480. Its totient is φ = 373222080.

The previous prime is 1258717877. The next prime is 1258717897. The reversal of 1258717878 is 8787178521.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1258717877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3170376 + ... + 3170772.

It is an arithmetic number, because the mean of its divisors is an integer number (31664880).

Almost surely, 2^1258717878 is an apocalyptic number.

1258717878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1258717878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1519914240).

1258717878 is an abundant number, since it is smaller than the sum of its proper divisors (1781110602).

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

1258717878 is a wasteful number, since it uses less digits than its factorization.

1258717878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 719 counting only the distinct ones).

The product of its digits is 1756160, while the sum is 54.

The square root of 1258717878 is about 35478.4142543040. The cubic root of 1258717878 is about 1079.7158254390.

The spelling of 1258717878 in words is "one billion, two hundred fifty-eight million, seven hundred seventeen thousand, eight hundred seventy-eight".