28857451 has 4 divisors (see below), whose sum is σ = 32979952. Its totient is φ = 24734952.

The previous prime is 28857443. The next prime is 28857467. The reversal of 28857451 is 15475882.

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 28857451 - 2³ = 28857443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28857421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2061240 + ... + 2061253.

It is an arithmetic number, because the mean of its divisors is an integer number (8244988).

Almost surely, 2^28857451 is an apocalyptic number.

28857451 is a deficient number, since it is larger than the sum of its proper divisors (4122501).

28857451 is an equidigital number, since it uses as much as digits as its factorization.

28857451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122500.

The product of its digits is 89600, while the sum is 40.

The square root of 28857451 is about 5371.9131601321. The cubic root of 28857451 is about 306.7274581489.

The spelling of 28857451 in words is "twenty-eight million, eight hundred fifty-seven thousand, four hundred fifty-one".