28402562821 has 8 divisors (see below), whose sum is σ = 29247180320. Its totient is φ = 27561997008.

The previous prime is 28402562801. The next prime is 28402562827. The reversal of 28402562821 is 12826520482.

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

It is a cyclic number.

It is not a de Polignac number, because 28402562821 - 2¹⁷ = 28402431749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402562827) 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 7 ways as a sum of consecutive naturals, for example, 998691 + ... + 1026736.

It is an arithmetic number, because the mean of its divisors is an integer number (3655897540).

Almost surely, 2^28402562821 is an apocalyptic number.

It is an amenable number.

28402562821 is a deficient number, since it is larger than the sum of its proper divisors (844617499).

28402562821 is a wasteful number, since it uses less digits than its factorization.

28402562821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025843.

The product of its (nonzero) digits is 122880, while the sum is 40.

The spelling of 28402562821 in words is "twenty-eight billion, four hundred two million, five hundred sixty-two thousand, eight hundred twenty-one".