1287450020 has 24 divisors (see below), whose sum is σ = 2769589368. Its totient is φ = 502419200.

The previous prime is 1287449939. The next prime is 1287450023. The reversal of 1287450020 is 200547821.

It can be written as a sum of positive squares in 4 ways, for example, as 50239744 + 1237210276 = 7088^2 + 35174^2 .

It is not an unprimeable number, because it can be changed into a prime (1287450023) 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 7 ways as a sum of consecutive naturals, for example, 784211 + ... + 785850.

It is an arithmetic number, because the mean of its divisors is an integer number (115399557).

Almost surely, 2^1287450020 is an apocalyptic number.

1287450020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287450020 is an abundant number, since it is smaller than the sum of its proper divisors (1482139348).

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

1287450020 is a wasteful number, since it uses less digits than its factorization.

1287450020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570111 (or 1570109 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 1287450020 is about 35881.0537749381. The cubic root of 1287450020 is about 1087.8694797744.

Adding to 1287450020 its reverse (200547821), we get a palindrome (1487997841).

The spelling of 1287450020 in words is "one billion, two hundred eighty-seven million, four hundred fifty thousand, twenty".