28671457 has 4 divisors (see below), whose sum is σ = 29281536. Its totient is φ = 28061380.

The previous prime is 28671451. The next prime is 28671481. The reversal of 28671457 is 75417682.

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 a cyclic number.

It is not a de Polignac number, because 28671457 - 2¹¹ = 28669409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28671451) 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, 304969 + ... + 305062.

It is an arithmetic number, because the mean of its divisors is an integer number (7320384).

Almost surely, 2^28671457 is an apocalyptic number.

It is an amenable number.

28671457 is a deficient number, since it is larger than the sum of its proper divisors (610079).

28671457 is an equidigital number, since it uses as much as digits as its factorization.

28671457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610078.

The product of its digits is 94080, while the sum is 40.

The square root of 28671457 is about 5354.5734657394. The cubic root of 28671457 is about 306.0670570855.

The spelling of 28671457 in words is "twenty-eight million, six hundred seventy-one thousand, four hundred fifty-seven".