28943487 has 14 divisors (see below), whose sum is σ = 43396472. Its totient is φ = 19295172.

The previous prime is 28943483. The next prime is 28943501. The reversal of 28943487 is 78434982.

It is not a de Polignac number, because 28943487 - 2² = 28943483 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 (28943483) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 19123 + ... + 20580.

It is an arithmetic number, because the mean of its divisors is an integer number (3099748).

Almost surely, 2^28943487 is an apocalyptic number.

28943487 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28943487 is a deficient number, since it is larger than the sum of its proper divisors (14452985).

28943487 is an frugal number, since it uses more digits than its factorization.

28943487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39721 (or 39706 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28943487 is about 5379.9151480298. The cubic root of 28943487 is about 307.0319828606.

The spelling of 28943487 in words is "twenty-eight million, nine hundred forty-three thousand, four hundred eighty-seven".