1287798258 has 16 divisors (see below), whose sum is σ = 2576426400. Its totient is φ = 429127776.

The previous prime is 1287798257. The next prime is 1287798269. The reversal of 1287798258 is 8528977821.

It is a junction number, because it is equal to n+sod(n) for n = 1287798198 and 1287798207.

It is not an unprimeable number, because it can be changed into a prime (1287798257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13408 + ... + 52491.

It is an arithmetic number, because the mean of its divisors is an integer number (161026650).

Almost surely, 2^1287798258 is an apocalyptic number.

1287798258 is an abundant number, since it is smaller than the sum of its proper divisors (1288628142).

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

1287798258 is a wasteful number, since it uses less digits than its factorization.

1287798258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69161.

The product of its digits is 4515840, while the sum is 57.

The square root of 1287798258 is about 35885.9061192552. The cubic root of 1287798258 is about 1087.9675556439.

The spelling of 1287798258 in words is "one billion, two hundred eighty-seven million, seven hundred ninety-eight thousand, two hundred fifty-eight".