1312778450 has 24 divisors (see below), whose sum is σ = 2454181092. Its totient is φ = 522441920.

The previous prime is 1312778387. The next prime is 1312778459. The reversal of 1312778450 is 548772131.

It can be written as a sum of positive squares in 6 ways, for example, as 833650129 + 479128321 = 28873^2 + 21889^2 .

It is not an unprimeable number, because it can be changed into a prime (1312778459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56789 + ... + 76488.

Almost surely, 2^1312778450 is an apocalyptic number.

1312778450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1312778450 is a deficient number, since it is larger than the sum of its proper divisors (1141402642).

1312778450 is a wasteful number, since it uses less digits than its factorization.

1312778450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133486 (or 133481 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 1312778450 is about 36232.2846367711. The cubic root of 1312778450 is about 1094.9572066149.

The spelling of 1312778450 in words is "one billion, three hundred twelve million, seven hundred seventy-eight thousand, four hundred fifty".