28687999451 has 4 divisors (see below), whose sum is σ = 28708361400. Its totient is φ = 28667637504.

The previous prime is 28687999421. The next prime is 28687999463. The reversal of 28687999451 is 15499978682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28687999451 - 2¹⁴ = 28687983067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28687999421) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10178861 + ... + 10181678.

It is an arithmetic number, because the mean of its divisors is an integer number (7177090350).

Almost surely, 2^28687999451 is an apocalyptic number.

28687999451 is a deficient number, since it is larger than the sum of its proper divisors (20361949).

28687999451 is a wasteful number, since it uses less digits than its factorization.

28687999451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20361948.

The product of its digits is 78382080, while the sum is 68.

The spelling of 28687999451 in words is "twenty-eight billion, six hundred eighty-seven million, nine hundred ninety-nine thousand, four hundred fifty-one".