28935638 has 8 divisors (see below), whose sum is σ = 43430688. Its totient is φ = 14458744.

The previous prime is 28935637. The next prime is 28935653. The reversal of 28935638 is 83653982.

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

It is a super-2 number, since 2×28935638² = 1674542292934088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28935631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620 + ... + 7632.

It is an arithmetic number, because the mean of its divisors is an integer number (5428836).

Almost surely, 2^28935638 is an apocalyptic number.

28935638 is a deficient number, since it is larger than the sum of its proper divisors (14495050).

28935638 is a wasteful number, since it uses less digits than its factorization.

28935638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9078.

The product of its digits is 311040, while the sum is 44.

The square root of 28935638 is about 5379.1856260962. The cubic root of 28935638 is about 307.0042263350.

The spelling of 28935638 in words is "twenty-eight million, nine hundred thirty-five thousand, six hundred thirty-eight".