28901638 has 8 divisors (see below), whose sum is σ = 44409960. Its totient is φ = 14098320.

The previous prime is 28901627. The next prime is 28901647. The reversal of 28901638 is 83610982.

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

It is a junction number, because it is equal to n+sod(n) for n = 28901597 and 28901606.

It is a congruent number.

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, 176148 + ... + 176311.

It is an arithmetic number, because the mean of its divisors is an integer number (5551245).

Almost surely, 2^28901638 is an apocalyptic number.

28901638 is a deficient number, since it is larger than the sum of its proper divisors (15508322).

28901638 is a wasteful number, since it uses less digits than its factorization.

28901638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352502.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28901638 is about 5376.0243675043. The cubic root of 28901638 is about 306.8839336736.

The spelling of 28901638 in words is "twenty-eight million, nine hundred one thousand, six hundred thirty-eight".