28580638 has 32 divisors (see below), whose sum is σ = 47130336. Its totient is φ = 12945408.

The previous prime is 28580627. The next prime is 28580641. The reversal of 28580638 is 83608582.

It is a self number, because there is not a number n which added to its sum of digits gives 28580638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165120 + ... + 165292.

It is an arithmetic number, because the mean of its divisors is an integer number (1472823).

Almost surely, 2^28580638 is an apocalyptic number.

28580638 is a deficient number, since it is larger than the sum of its proper divisors (18549698).

28580638 is a wasteful number, since it uses less digits than its factorization.

28580638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28580638 is about 5346.0862320019. The cubic root of 28580638 is about 305.7435517819.

The spelling of 28580638 in words is "twenty-eight million, five hundred eighty thousand, six hundred thirty-eight".