1257516868 has 24 divisors (see below), whose sum is σ = 2226307160. Its totient is φ = 621457920.

The previous prime is 1257516859. The next prime is 1257516889. The reversal of 1257516868 is 8686157521.

It can be written as a sum of positive squares in 4 ways, for example, as 334450944 + 923065924 = 18288^2 + 30382^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185458 + ... + 192118.

Almost surely, 2^1257516868 is an apocalyptic number.

It is an amenable number.

1257516868 is a deficient number, since it is larger than the sum of its proper divisors (968790292).

1257516868 is a wasteful number, since it uses less digits than its factorization.

1257516868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7207 (or 7205 counting only the distinct ones).

The product of its digits is 806400, while the sum is 49.

The square root of 1257516868 is about 35461.4842892962. The cubic root of 1257516868 is about 1079.3723113025.

The spelling of 1257516868 in words is "one billion, two hundred fifty-seven million, five hundred sixteen thousand, eight hundred sixty-eight".