28638615 has 8 divisors (see below), whose sum is σ = 45821808. Its totient is φ = 15273920.

The previous prime is 28638613. The next prime is 28638641. The reversal of 28638615 is 51683682.

It is a happy number.

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

It is not a de Polignac number, because 28638615 - 2¹ = 28638613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28638613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954606 + ... + 954635.

It is an arithmetic number, because the mean of its divisors is an integer number (5727726).

Almost surely, 2^28638615 is an apocalyptic number.

28638615 is a deficient number, since it is larger than the sum of its proper divisors (17183193).

28638615 is a wasteful number, since it uses less digits than its factorization.

28638615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909249.

The product of its digits is 69120, while the sum is 39.

The square root of 28638615 is about 5351.5058628390. The cubic root of 28638615 is about 305.9501499383.

The spelling of 28638615 in words is "twenty-eight million, six hundred thirty-eight thousand, six hundred fifteen".