28889405 has 8 divisors (see below), whose sum is σ = 36492000. Its totient is φ = 21895056.

The previous prime is 28889389. The next prime is 28889407. The reversal of 28889405 is 50498882.

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 28889405 - 2⁴ = 28889389 is a prime.

It is a super-3 number, since 3×28889405³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28889407) 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, 151955 + ... + 152144.

It is an arithmetic number, because the mean of its divisors is an integer number (4561500).

Almost surely, 2^28889405 is an apocalyptic number.

It is an amenable number.

28889405 is a deficient number, since it is larger than the sum of its proper divisors (7602595).

28889405 is a wasteful number, since it uses less digits than its factorization.

28889405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304123.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 28889405 is about 5374.8865104298. The cubic root of 28889405 is about 306.8406300041.

The spelling of 28889405 in words is "twenty-eight million, eight hundred eighty-nine thousand, four hundred five".