1257132650 has 24 divisors (see below), whose sum is σ = 2343516300. Its totient is φ = 501724160.

The previous prime is 1257132637. The next prime is 1257132659. The reversal of 1257132650 is 562317521.

It can be written as a sum of positive squares in 6 ways, for example, as 461949049 + 795183601 = 21493^2 + 28199^2 .

It is not an unprimeable number, because it can be changed into a prime (1257132659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5549 + ... + 50448.

Almost surely, 2^1257132650 is an apocalyptic number.

1257132650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1257132650 is a deficient number, since it is larger than the sum of its proper divisors (1086383650).

1257132650 is a wasteful number, since it uses less digits than its factorization.

1257132650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56458 (or 56453 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1257132650 is about 35456.0664766976. The cubic root of 1257132650 is about 1079.2623706925.

The spelling of 1257132650 in words is "one billion, two hundred fifty-seven million, one hundred thirty-two thousand, six hundred fifty".