28418487 has 4 divisors (see below), whose sum is σ = 37891320. Its totient is φ = 18945656.

The previous prime is 28418473. The next prime is 28418491. The reversal of 28418487 is 78481482.

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 28418487 - 2⁷ = 28418359 is a prime.

It is a super-2 number, since 2×28418487² = 1615220806738338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28418437) 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, 4736412 + ... + 4736417.

It is an arithmetic number, because the mean of its divisors is an integer number (9472830).

Almost surely, 2^28418487 is an apocalyptic number.

28418487 is a deficient number, since it is larger than the sum of its proper divisors (9472833).

28418487 is an equidigital number, since it uses as much as digits as its factorization.

28418487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9472832.

The product of its digits is 114688, while the sum is 42.

The square root of 28418487 is about 5330.8992674782. The cubic root of 28418487 is about 305.1642472864.

The spelling of 28418487 in words is "twenty-eight million, four hundred eighteen thousand, four hundred eighty-seven".