28764638 has 8 divisors (see below), whose sum is σ = 49310832. Its totient is φ = 12327696.

The previous prime is 28764601. The next prime is 28764647. The reversal of 28764638 is 83646782.

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

It is a congruent number.

It is an unprimeable number.

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, 1027295 + ... + 1027322.

It is an arithmetic number, because the mean of its divisors is an integer number (6163854).

Almost surely, 2^28764638 is an apocalyptic number.

28764638 is a deficient number, since it is larger than the sum of its proper divisors (20546194).

28764638 is a wasteful number, since it uses less digits than its factorization.

28764638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054626.

The product of its digits is 387072, while the sum is 44.

The square root of 28764638 is about 5363.2674742176. The cubic root of 28764638 is about 306.3982667882.

The spelling of 28764638 in words is "twenty-eight million, seven hundred sixty-four thousand, six hundred thirty-eight".