28073497 has 4 divisors (see below), whose sum is σ = 28103040. Its totient is φ = 28043956.

The previous prime is 28073473. The next prime is 28073503. The reversal of 28073497 is 79437082.

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 28073497 - 2⁷ = 28073369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28073447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13297 + ... + 15262.

It is an arithmetic number, because the mean of its divisors is an integer number (7025760).

Almost surely, 2^28073497 is an apocalyptic number.

It is an amenable number.

28073497 is a deficient number, since it is larger than the sum of its proper divisors (29543).

28073497 is an equidigital number, since it uses as much as digits as its factorization.

28073497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29542.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 28073497 is about 5298.4428844709. The cubic root of 28073497 is about 303.9243557462.

The spelling of 28073497 in words is "twenty-eight million, seventy-three thousand, four hundred ninety-seven".