28687457 has 8 divisors (see below), whose sum is σ = 29405376. Its totient is φ = 27978192.

The previous prime is 28687447. The next prime is 28687481. The reversal of 28687457 is 75478682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28687457 - 2⁴ = 28687441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28687447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4823 + ... + 8979.

It is an arithmetic number, because the mean of its divisors is an integer number (3675672).

Almost surely, 2^28687457 is an apocalyptic number.

It is an amenable number.

28687457 is a deficient number, since it is larger than the sum of its proper divisors (717919).

28687457 is a wasteful number, since it uses less digits than its factorization.

28687457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327.

The product of its digits is 752640, while the sum is 47.

The square root of 28687457 is about 5356.0673072694. The cubic root of 28687457 is about 306.1239796928.

The spelling of 28687457 in words is "twenty-eight million, six hundred eighty-seven thousand, four hundred fifty-seven".