28745197 has 6 divisors (see below), whose sum is σ = 30977198. Its totient is φ = 26516184.

The previous prime is 28745191. The next prime is 28745201. The reversal of 28745197 is 79154782.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 8844676 = 4461^2 + 2974^2 .

It is not a de Polignac number, because 28745197 - 2⁷ = 28745069 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 (28745191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18588 + ... + 20074.

Almost surely, 2^28745197 is an apocalyptic number.

It is an amenable number.

28745197 is a deficient number, since it is larger than the sum of its proper divisors (2232001).

28745197 is an frugal number, since it uses more digits than its factorization.

28745197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987 (or 1500 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 28745197 is about 5361.4547466150. The cubic root of 28745197 is about 306.3292233192.

The spelling of 28745197 in words is "twenty-eight million, seven hundred forty-five thousand, one hundred ninety-seven".