28628138 has 16 divisors (see below), whose sum is σ = 53538624. Its totient is φ = 11153760.

The previous prime is 28628113. The next prime is 28628143. The reversal of 28628138 is 83182682.

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 7 ways as a sum of consecutive naturals, for example, 92795 + ... + 93102.

It is an arithmetic number, because the mean of its divisors is an integer number (3346164).

Almost surely, 2^28628138 is an apocalyptic number.

28628138 is a deficient number, since it is larger than the sum of its proper divisors (24910486).

28628138 is a wasteful number, since it uses less digits than its factorization.

28628138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185917.

The product of its digits is 36864, while the sum is 38.

The square root of 28628138 is about 5350.5268899427. The cubic root of 28628138 is about 305.9128363242.

The spelling of 28628138 in words is "twenty-eight million, six hundred twenty-eight thousand, one hundred thirty-eight".