1258330820 has 48 divisors (see below), whose sum is σ = 2802204720. Its totient is φ = 473001984.

The previous prime is 1258330811. The next prime is 1258330873. The reversal of 1258330820 is 280338521.

It can be written as a sum of positive squares in 8 ways, for example, as 70425664 + 1187905156 = 8392^2 + 34466^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254936 + ... + 259824.

It is an arithmetic number, because the mean of its divisors is an integer number (58379265).

Almost surely, 2^1258330820 is an apocalyptic number.

1258330820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1258330820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1401102360).

1258330820 is an abundant number, since it is smaller than the sum of its proper divisors (1543873900).

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

1258330820 is a wasteful number, since it uses less digits than its factorization.

1258330820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672 (or 5670 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1258330820 is about 35472.9589969599. The cubic root of 1258330820 is about 1079.6051425770.

The spelling of 1258330820 in words is "one billion, two hundred fifty-eight million, three hundred thirty thousand, eight hundred twenty".