28347457 has 4 divisors (see below), whose sum is σ = 28444500. Its totient is φ = 28250416.

The previous prime is 28347443. The next prime is 28347463. The reversal of 28347457 is 75474382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75474382 = 2 ⋅37737191.

It can be written as a sum of positive squares in 2 ways, for example, as 26204161 + 2143296 = 5119^2 + 1464^2 .

It is a cyclic number.

It is not a de Polignac number, because 28347457 - 2²³ = 19958849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28347427) 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, 48082 + ... + 48667.

It is an arithmetic number, because the mean of its divisors is an integer number (7111125).

Almost surely, 2^28347457 is an apocalyptic number.

It is an amenable number.

28347457 is a deficient number, since it is larger than the sum of its proper divisors (97043).

28347457 is an equidigital number, since it uses as much as digits as its factorization.

28347457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97042.

The product of its digits is 188160, while the sum is 40.

The square root of 28347457 is about 5324.2329964043. The cubic root of 28347457 is about 304.9097896786.

The spelling of 28347457 in words is "twenty-eight million, three hundred forty-seven thousand, four hundred fifty-seven".