28670073 has 4 divisors (see below), whose sum is σ = 38226768. Its totient is φ = 19113380.

The previous prime is 28670063. The next prime is 28670077. The reversal of 28670073 is 37007682.

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 a cyclic number.

It is not a de Polignac number, because 28670073 - 2¹⁰ = 28669049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28670077) 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, 4778343 + ... + 4778348.

It is an arithmetic number, because the mean of its divisors is an integer number (9556692).

Almost surely, 2^28670073 is an apocalyptic number.

It is an amenable number.

28670073 is a deficient number, since it is larger than the sum of its proper divisors (9556695).

28670073 is an equidigital number, since it uses as much as digits as its factorization.

28670073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556694.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 28670073 is about 5354.4442288626. Note that the first 3 decimals coincide. The cubic root of 28670073 is about 306.0621322849.

The spelling of 28670073 in words is "twenty-eight million, six hundred seventy thousand, seventy-three".