1287227820 has 48 divisors (see below), whose sum is σ = 3606801408. Its totient is φ = 343016640.

The previous prime is 1287227819. The next prime is 1287227831. The reversal of 1287227820 is 287227821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87175 + ... + 100865.

It is an arithmetic number, because the mean of its divisors is an integer number (75141696).

Almost surely, 2^1287227820 is an apocalyptic number.

1287227820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287227820 is an abundant number, since it is smaller than the sum of its proper divisors (2319573588).

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

1287227820 is a wasteful number, since it uses less digits than its factorization.

1287227820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15270 (or 15268 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 1287227820 is about 35877.9572997126. The cubic root of 1287227820 is about 1087.8068913238.

Subtracting from 1287227820 its reverse (287227821), we obtain a palindrome (999999999).

The spelling of 1287227820 in words is "one billion, two hundred eighty-seven million, two hundred twenty-seven thousand, eight hundred twenty".