1287888890 has 32 divisors (see below), whose sum is σ = 2468335680. Its totient is φ = 482132224.

The previous prime is 1287888871. The next prime is 1287888947. The reversal of 1287888890 is 988887821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9269 + ... + 51591.

It is an arithmetic number, because the mean of its divisors is an integer number (77135490).

Almost surely, 2^1287888890 is an apocalyptic number.

1287888890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287888890 is a deficient number, since it is larger than the sum of its proper divisors (1180446790).

1287888890 is a wasteful number, since it uses less digits than its factorization.

1287888890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42526.

The product of its (nonzero) digits is 4128768, while the sum is 59.

The square root of 1287888890 is about 35887.1688769120. The cubic root of 1287888890 is about 1087.9930778512.

The spelling of 1287888890 in words is "one billion, two hundred eighty-seven million, eight hundred eighty-eight thousand, eight hundred ninety".