1263250640 has 40 divisors (see below), whose sum is σ = 2943514728. Its totient is φ = 504189440.

The previous prime is 1263250627. The next prime is 1263250657. The reversal of 1263250640 is 460523621.

It can be written as a sum of positive squares in 4 ways, for example, as 5271616 + 1257979024 = 2296^2 + 35468^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 19754 + ... + 54006.

Almost surely, 2^1263250640 is an apocalyptic number.

1263250640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263250640 is an abundant number, since it is smaller than the sum of its proper divisors (1680264088).

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

1263250640 is a wasteful number, since it uses less digits than its factorization.

1263250640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34727 (or 34721 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1263250640 is about 35542.2374084694. The cubic root of 1263250640 is about 1081.0103257066.

The spelling of 1263250640 in words is "one billion, two hundred sixty-three million, two hundred fifty thousand, six hundred forty".