28685451 has 4 divisors (see below), whose sum is σ = 38247272. Its totient is φ = 19123632.

The previous prime is 28685441. The next prime is 28685467. The reversal of 28685451 is 15458682.

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

It is not a de Polignac number, because 28685451 - 2¹⁵ = 28652683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28685401) 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, 4780906 + ... + 4780911.

It is an arithmetic number, because the mean of its divisors is an integer number (9561818).

Almost surely, 2^28685451 is an apocalyptic number.

28685451 is a deficient number, since it is larger than the sum of its proper divisors (9561821).

28685451 is an equidigital number, since it uses as much as digits as its factorization.

28685451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9561820.

The product of its digits is 76800, while the sum is 39.

The square root of 28685451 is about 5355.8800397320. The cubic root of 28685451 is about 306.1168441816.

The spelling of 28685451 in words is "twenty-eight million, six hundred eighty-five thousand, four hundred fifty-one".