1287055400 has 24 divisors (see below), whose sum is σ = 2992404270. Its totient is φ = 514822080.

The previous prime is 1287055387. The next prime is 1287055457. The reversal of 1287055400 is 45507821.

It can be written as a sum of positive squares in 3 ways, for example, as 559890244 + 727165156 = 23662^2 + 26966^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3217439 + ... + 3217838.

Almost surely, 2^1287055400 is an apocalyptic number.

1287055400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287055400 is an abundant number, since it is smaller than the sum of its proper divisors (1705348870).

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

1287055400 is a wasteful number, since it uses less digits than its factorization.

1287055400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435293 (or 6435284 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 1287055400 is about 35875.5543511177. The cubic root of 1287055400 is about 1087.7583197510.

The spelling of 1287055400 in words is "one billion, two hundred eighty-seven million, fifty-five thousand, four hundred".