28920693 has 4 divisors (see below), whose sum is σ = 38560928. Its totient is φ = 19280460.

The previous prime is 28920677. The next prime is 28920707. The reversal of 28920693 is 39602982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28920693 - 2⁴ = 28920677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921693) 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, 4820113 + ... + 4820118.

It is an arithmetic number, because the mean of its divisors is an integer number (9640232).

Almost surely, 2^28920693 is an apocalyptic number.

It is an amenable number.

28920693 is a deficient number, since it is larger than the sum of its proper divisors (9640235).

28920693 is an equidigital number, since it uses as much as digits as its factorization.

28920693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9640234.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 28920693 is about 5377.7962958818. The cubic root of 28920693 is about 306.9513622474.

The spelling of 28920693 in words is "twenty-eight million, nine hundred twenty thousand, six hundred ninety-three".