28638607 has 4 divisors (see below), whose sum is σ = 28892160. Its totient is φ = 28385056.

The previous prime is 28638583. The next prime is 28638613. The reversal of 28638607 is 70683682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70683682 = 2 ⋅35341841.

It is a cyclic number.

It is not a de Polignac number, because 28638607 - 2⁷ = 28638479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28638607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28638647) 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 3 ways as a sum of consecutive naturals, for example, 126607 + ... + 126832.

It is an arithmetic number, because the mean of its divisors is an integer number (7223040).

Almost surely, 2^28638607 is an apocalyptic number.

28638607 is a deficient number, since it is larger than the sum of its proper divisors (253553).

28638607 is a wasteful number, since it uses less digits than its factorization.

28638607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253552.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 28638607 is about 5351.5051153858. The cubic root of 28638607 is about 305.9501214499.

The spelling of 28638607 in words is "twenty-eight million, six hundred thirty-eight thousand, six hundred seven".