28401621889728 has 84 divisors (see below), whose sum is σ = 76398055885320. Its totient is φ = 9312006942720.

The previous prime is 28401621889703. The next prime is 28401621889733. The reversal of 28401621889728 is 82798812610482.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19162633 + ... + 20591496.

Almost surely, 2^{28401621889728} is an apocalyptic number.

It is an amenable number.

28401621889728 is an abundant number, since it is smaller than the sum of its proper divisors (47996433995592).

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

28401621889728 is an equidigital number, since it uses as much as digits as its factorization.

28401621889728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39754266 (or 39754195 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 66.

The spelling of 28401621889728 in words is "twenty-eight trillion, four hundred one billion, six hundred twenty-one million, eight hundred eighty-nine thousand, seven hundred twenty-eight".