28678389 has 8 divisors (see below), whose sum is σ = 38530272. Its totient is φ = 18972720.

The previous prime is 28678387. The next prime is 28678399. The reversal of 28678389 is 98387682.

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

It is not a de Polignac number, because 28678389 - 2¹ = 28678387 is a prime.

It is a super-3 number, since 3×28678389³ (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 (28678387) 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, 36094 + ... + 36879.

It is an arithmetic number, because the mean of its divisors is an integer number (4816284).

Almost surely, 2^28678389 is an apocalyptic number.

It is an amenable number.

28678389 is a deficient number, since it is larger than the sum of its proper divisors (9851883).

28678389 is a wasteful number, since it uses less digits than its factorization.

28678389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73107.

The product of its digits is 1161216, while the sum is 51.

The square root of 28678389 is about 5355.2207237424. The cubic root of 28678389 is about 306.0917214044.

The spelling of 28678389 in words is "twenty-eight million, six hundred seventy-eight thousand, three hundred eighty-nine".