28887481 has 4 divisors (see below), whose sum is σ = 33014272. Its totient is φ = 24760692.

The previous prime is 28887479. The next prime is 28887497. The reversal of 28887481 is 18478882.

It is a happy number.

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 28887481 - 2¹ = 28887479 is a prime.

It is a super-2 number, since 2×28887481² = 1668973117050722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28887401) 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, 2063385 + ... + 2063398.

It is an arithmetic number, because the mean of its divisors is an integer number (8253568).

Almost surely, 2^28887481 is an apocalyptic number.

It is an amenable number.

28887481 is a deficient number, since it is larger than the sum of its proper divisors (4126791).

28887481 is an equidigital number, since it uses as much as digits as its factorization.

28887481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126790.

The product of its digits is 229376, while the sum is 46.

The square root of 28887481 is about 5374.7075269265. The cubic root of 28887481 is about 306.8338181125.

The spelling of 28887481 in words is "twenty-eight million, eight hundred eighty-seven thousand, four hundred eighty-one".