28157028409 has 8 divisors (see below), whose sum is σ = 29147668992. Its totient is φ = 27171534720.

The previous prime is 28157028407. The next prime is 28157028451. The reversal of 28157028409 is 90482075182.

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

It is not a de Polignac number, because 28157028409 - 2¹ = 28157028407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28157028401) 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, 1275589 + ... + 1297474.

It is an arithmetic number, because the mean of its divisors is an integer number (3643458624).

Almost surely, 2^28157028409 is an apocalyptic number.

It is an amenable number.

28157028409 is a deficient number, since it is larger than the sum of its proper divisors (990640583).

28157028409 is a wasteful number, since it uses less digits than its factorization.

28157028409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573447.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 28157028409 in words is "twenty-eight billion, one hundred fifty-seven million, twenty-eight thousand, four hundred nine".