1287659020 has 24 divisors (see below), whose sum is σ = 2706357024. Its totient is φ = 514630656.

The previous prime is 1287658991. The next prime is 1287659029. The reversal of 1287659020 is 209567821.

It is not an unprimeable number, because it can be changed into a prime (1287659029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2112 + ... + 50791.

It is an arithmetic number, because the mean of its divisors is an integer number (112764876).

Almost surely, 2^1287659020 is an apocalyptic number.

1287659020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287659020 is an abundant number, since it is smaller than the sum of its proper divisors (1418698004).

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

1287659020 is a wasteful number, since it uses less digits than its factorization.

1287659020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54129 (or 54127 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1287659020 is about 35883.9660572797. The cubic root of 1287659020 is about 1087.9283435272.

The spelling of 1287659020 in words is "one billion, two hundred eighty-seven million, six hundred fifty-nine thousand, twenty".