28573697 has 4 divisors (see below), whose sum is σ = 29181696. Its totient is φ = 27965700.

The previous prime is 28573673. The next prime is 28573709. The reversal of 28573697 is 79637582.

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 28573697 - 2¹² = 28569601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 607951 = 28573697 / (2 + 8 + 5 + 7 + 3 + 6 + 9 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28573627) 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, 303929 + ... + 304022.

It is an arithmetic number, because the mean of its divisors is an integer number (7295424).

It is a Proth number, since it is equal to 109 ⋅ 2¹⁸ + 1 and 109 < 2¹⁸.

Almost surely, 2^28573697 is an apocalyptic number.

It is an amenable number.

28573697 is a deficient number, since it is larger than the sum of its proper divisors (607999).

28573697 is an equidigital number, since it uses as much as digits as its factorization.

28573697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607998.

The product of its digits is 635040, while the sum is 47.

The square root of 28573697 is about 5345.4370260999. The cubic root of 28573697 is about 305.7187991527.

The spelling of 28573697 in words is "twenty-eight million, five hundred seventy-three thousand, six hundred ninety-seven".