28638670 has 8 divisors (see below), whose sum is σ = 51549624. Its totient is φ = 11455464.

The previous prime is 28638647. The next prime is 28638679. The reversal of 28638670 is 7683682.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28638679) 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, 1431924 + ... + 1431943.

It is an arithmetic number, because the mean of its divisors is an integer number (6443703).

Almost surely, 2^28638670 is an apocalyptic number.

28638670 is a deficient number, since it is larger than the sum of its proper divisors (22910954).

28638670 is a wasteful number, since it uses less digits than its factorization.

28638670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863874.

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

The square root of 28638670 is about 5351.5110015770. The cubic root of 28638670 is about 305.9503457956.

The spelling of 28638670 in words is "twenty-eight million, six hundred thirty-eight thousand, six hundred seventy".