28398715 has 8 divisors (see below), whose sum is σ = 34107120. Its totient is φ = 22699872.

The previous prime is 28398707. The next prime is 28398761. The reversal of 28398715 is 51789382.

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 28398715 - 2³ = 28398707 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9916 + ... + 12454.

It is an arithmetic number, because the mean of its divisors is an integer number (4263390).

Almost surely, 2^28398715 is an apocalyptic number.

28398715 is a deficient number, since it is larger than the sum of its proper divisors (5708405).

28398715 is a wasteful number, since it uses less digits than its factorization.

28398715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781.

The product of its digits is 120960, while the sum is 43.

The square root of 28398715 is about 5329.0444734493. The cubic root of 28398715 is about 305.0934587730.

The spelling of 28398715 in words is "twenty-eight million, three hundred ninety-eight thousand, seven hundred fifteen".