1287628267821 has 8 divisors (see below), whose sum is σ = 1962100217664. Its totient is φ = 735787581600.

The previous prime is 1287628267753. The next prime is 1287628267823.

1287628267821 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1287628267821 - 2⁹ = 1287628267309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287628267823) 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, 30657815880 + ... + 30657815921.

It is an arithmetic number, because the mean of its divisors is an integer number (245262527208).

Almost surely, 2^{1287628267821} is an apocalyptic number.

It is an amenable number.

1287628267821 is a deficient number, since it is larger than the sum of its proper divisors (674471949843).

1287628267821 is an equidigital number, since it uses as much as digits as its factorization.

1287628267821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61315631811.

The product of its digits is 14450688, while the sum is 60.

The spelling of 1287628267821 in words is "one trillion, two hundred eighty-seven billion, six hundred twenty-eight million, two hundred sixty-seven thousand, eight hundred twenty-one".