28329387 has 8 divisors (see below), whose sum is σ = 37931520. Its totient is φ = 18806760.

The previous prime is 28329359. The next prime is 28329397. The reversal of 28329387 is 78392382.

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

It is not a de Polignac number, because 28329387 - 2¹¹ = 28327339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28329397) 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, 19039 + ... + 20472.

It is an arithmetic number, because the mean of its divisors is an integer number (4741440).

Almost surely, 2^28329387 is an apocalyptic number.

28329387 is a deficient number, since it is larger than the sum of its proper divisors (9602133).

28329387 is a wasteful number, since it uses less digits than its factorization.

28329387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39753.

The product of its digits is 145152, while the sum is 42.

The square root of 28329387 is about 5322.5357678460. The cubic root of 28329387 is about 304.8449879690.

The spelling of 28329387 in words is "twenty-eight million, three hundred twenty-nine thousand, three hundred eighty-seven".