28347451 has 4 divisors (see below), whose sum is σ = 30924504. Its totient is φ = 25770400.

The previous prime is 28347443. The next prime is 28347463. The reversal of 28347451 is 15474382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28347451 - 2³ = 28347443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28347481) 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, 1288510 + ... + 1288531.

It is an arithmetic number, because the mean of its divisors is an integer number (7731126).

Almost surely, 2^28347451 is an apocalyptic number.

28347451 is a deficient number, since it is larger than the sum of its proper divisors (2577053).

28347451 is a wasteful number, since it uses less digits than its factorization.

28347451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577052.

The product of its digits is 26880, while the sum is 34.

The square root of 28347451 is about 5324.2324329428. The cubic root of 28347451 is about 304.9097681663.

The spelling of 28347451 in words is "twenty-eight million, three hundred forty-seven thousand, four hundred fifty-one".