28638146 has 8 divisors (see below), whose sum is σ = 43382844. Its totient is φ = 14177200.

The previous prime is 28638139. The next prime is 28638157. The reversal of 28638146 is 64183682.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28504921 + 133225 = 5339^2 + 365^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70685 + ... + 71088.

Almost surely, 2^28638146 is an apocalyptic number.

28638146 is a deficient number, since it is larger than the sum of its proper divisors (14744698).

28638146 is a wasteful number, since it uses less digits than its factorization.

28638146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141876.

The product of its digits is 55296, while the sum is 38.

The square root of 28638146 is about 5351.4620432177. The cubic root of 28638146 is about 305.9484797993.

The spelling of 28638146 in words is "twenty-eight million, six hundred thirty-eight thousand, one hundred forty-six".