28639793 has 8 divisors (see below), whose sum is σ = 35249088. Its totient is φ = 22659984.

The previous prime is 28639789. The next prime is 28639799. The reversal of 28639793 is 39793682.

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

It is a cyclic number.

It is not a de Polignac number, because 28639793 - 2² = 28639789 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28639799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157271 + ... + 157452.

It is an arithmetic number, because the mean of its divisors is an integer number (4406136).

Almost surely, 2^28639793 is an apocalyptic number.

It is an amenable number.

28639793 is a deficient number, since it is larger than the sum of its proper divisors (6609295).

28639793 is a wasteful number, since it uses less digits than its factorization.

28639793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314743.

The product of its digits is 489888, while the sum is 47.

The square root of 28639793 is about 5351.6159241859. The cubic root of 28639793 is about 305.9543447912.

The spelling of 28639793 in words is "twenty-eight million, six hundred thirty-nine thousand, seven hundred ninety-three".