28815401021 has 8 divisors (see below), whose sum is σ = 31438041600. Its totient is φ = 26193270240.

The previous prime is 28815400949. The next prime is 28815401023. The reversal of 28815401021 is 12010451882.

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 28815401021 - 2¹⁰ = 28815399997 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 (28815401023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4061 + ... + 240098.

It is an arithmetic number, because the mean of its divisors is an integer number (3929755200).

Almost surely, 2^28815401021 is an apocalyptic number.

It is an amenable number.

28815401021 is a deficient number, since it is larger than the sum of its proper divisors (2622640579).

28815401021 is a wasteful number, since it uses less digits than its factorization.

28815401021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254899.

The product of its (nonzero) digits is 5120, while the sum is 32.

The spelling of 28815401021 in words is "twenty-eight billion, eight hundred fifteen million, four hundred one thousand, twenty-one".