28572197 has 4 divisors (see below), whose sum is σ = 28743456. Its totient is φ = 28400940.

The previous prime is 28572191. The next prime is 28572239. The reversal of 28572197 is 79127582.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79127582 = 2 ⋅39563791.

It is a cyclic number.

It is not a de Polignac number, because 28572197 - 2¹² = 28568101 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 (28572191) 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, 85379 + ... + 85712.

It is an arithmetic number, because the mean of its divisors is an integer number (7185864).

Almost surely, 2^28572197 is an apocalyptic number.

It is an amenable number.

28572197 is a deficient number, since it is larger than the sum of its proper divisors (171259).

28572197 is a wasteful number, since it uses less digits than its factorization.

28572197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171258.

The product of its digits is 70560, while the sum is 41.

The square root of 28572197 is about 5345.2967176762. The cubic root of 28572197 is about 305.7134494048.

The spelling of 28572197 in words is "twenty-eight million, five hundred seventy-two thousand, one hundred ninety-seven".