28906487 has 4 divisors (see below), whose sum is σ = 28918536. Its totient is φ = 28894440.

The previous prime is 28906483. The next prime is 28906523. The reversal of 28906487 is 78460982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28906487 - 2² = 28906483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28906481) 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, 1064 + ... + 7677.

It is an arithmetic number, because the mean of its divisors is an integer number (7229634).

Almost surely, 2^28906487 is an apocalyptic number.

28906487 is a deficient number, since it is larger than the sum of its proper divisors (12049).

28906487 is an equidigital number, since it uses as much as digits as its factorization.

28906487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12048.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28906487 is about 5376.4753324088. The cubic root of 28906487 is about 306.9010952959.

The spelling of 28906487 in words is "twenty-eight million, nine hundred six thousand, four hundred eighty-seven".