1257431768 has 16 divisors (see below), whose sum is σ = 2365735680. Its totient is φ = 626568928.

The previous prime is 1257431767. The next prime is 1257431771. The reversal of 1257431768 is 8671347521.

It is a super-2 number, since 2×1257431768² = 3162269302351211648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257431767) 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, 265880 + ... + 270567.

It is an arithmetic number, because the mean of its divisors is an integer number (147858480).

Almost surely, 2^1257431768 is an apocalyptic number.

It is an amenable number.

1257431768 is a deficient number, since it is larger than the sum of its proper divisors (1108303912).

1257431768 is a wasteful number, since it uses less digits than its factorization.

1257431768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536746 (or 536742 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The square root of 1257431768 is about 35460.2843756223. The cubic root of 1257431768 is about 1079.3479626150.

The spelling of 1257431768 in words is "one billion, two hundred fifty-seven million, four hundred thirty-one thousand, seven hundred sixty-eight".