1257630664 has 32 divisors (see below), whose sum is σ = 2392097400. Its totient is φ = 619799040.

The previous prime is 1257630659. The next prime is 1257630677. The reversal of 1257630664 is 4660367521.

It can be written as a sum of positive squares in 4 ways, for example, as 1106094564 + 151536100 = 33258^2 + 12310^2 .

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, 168124 + ... + 175444.

Almost surely, 2^1257630664 is an apocalyptic number.

It is an amenable number.

1257630664 is a deficient number, since it is larger than the sum of its proper divisors (1134466736).

1257630664 is a wasteful number, since it uses less digits than its factorization.

1257630664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7633 (or 7629 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 1257630664 is about 35463.0887543654. The cubic root of 1257630664 is about 1079.4048687310.

The spelling of 1257630664 in words is "one billion, two hundred fifty-seven million, six hundred thirty thousand, six hundred sixty-four".