28901889 has 12 divisors (see below), whose sum is σ = 43094272. Its totient is φ = 18646200.

The previous prime is 28901881. The next prime is 28901911. The reversal of 28901889 is 98810982.

It is not a de Polignac number, because 28901889 - 2³ = 28901881 is a prime.

It is a super-3 number, since 3×28901889³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28901881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51517 + ... + 52074.

Almost surely, 2^28901889 is an apocalyptic number.

It is an amenable number.

28901889 is a deficient number, since it is larger than the sum of its proper divisors (14192383).

28901889 is a wasteful number, since it uses less digits than its factorization.

28901889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103628 (or 103625 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 28901889 is about 5376.0477118419. The cubic root of 28901889 is about 306.8848220621.

The spelling of 28901889 in words is "twenty-eight million, nine hundred one thousand, eight hundred eighty-nine".