28400889170 has 8 divisors (see below), whose sum is σ = 51121600524. Its totient is φ = 11360355664.

The previous prime is 28400889169. The next prime is 28400889191. The reversal of 28400889170 is 7198800482.

It can be written as a sum of positive squares in 2 ways, for example, as 27171895921 + 1228993249 = 164839^2 + 35057^2 .

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

It is a super-2 number, since 2×28400889170² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420044449 + ... + 1420044468.

Almost surely, 2^28400889170 is an apocalyptic number.

28400889170 is a deficient number, since it is larger than the sum of its proper divisors (22720711354).

28400889170 is a wasteful number, since it uses less digits than its factorization.

28400889170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840088924.

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 28400889170 in words is "twenty-eight billion, four hundred million, eight hundred eighty-nine thousand, one hundred seventy".