28947297 has 4 divisors (see below), whose sum is σ = 38596400. Its totient is φ = 19298196.

The previous prime is 28947293. The next prime is 28947313. The reversal of 28947297 is 79274982.

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 not a de Polignac number, because 28947297 - 2² = 28947293 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28947293) 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, 4824547 + ... + 4824552.

It is an arithmetic number, because the mean of its divisors is an integer number (9649100).

Almost surely, 2^28947297 is an apocalyptic number.

It is an amenable number.

28947297 is a deficient number, since it is larger than the sum of its proper divisors (9649103).

28947297 is an equidigital number, since it uses as much as digits as its factorization.

28947297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9649102.

The product of its digits is 508032, while the sum is 48.

The square root of 28947297 is about 5380.2692311817. The cubic root of 28947297 is about 307.0454544063.

It can be divided in two parts, 289 and 47297, that added together give a triangular number (47586 = T₃₀₈).

The spelling of 28947297 in words is "twenty-eight million, nine hundred forty-seven thousand, two hundred ninety-seven".