28149487 has 4 divisors (see below), whose sum is σ = 28611016. Its totient is φ = 27687960.

The previous prime is 28149481. The next prime is 28149491. The reversal of 28149487 is 78494182.

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 28149487 - 2³ = 28149479 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 (28149481) 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, 230673 + ... + 230794.

It is an arithmetic number, because the mean of its divisors is an integer number (7152754).

Almost surely, 2^28149487 is an apocalyptic number.

28149487 is a deficient number, since it is larger than the sum of its proper divisors (461529).

28149487 is an equidigital number, since it uses as much as digits as its factorization.

28149487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461528.

The product of its digits is 129024, while the sum is 43.

The square root of 28149487 is about 5305.6090131106. The cubic root of 28149487 is about 304.1983318841.

The spelling of 28149487 in words is "twenty-eight million, one hundred forty-nine thousand, four hundred eighty-seven".