28981456 has 20 divisors (see below), whose sum is σ = 64173472. Its totient is φ = 12420576.

The previous prime is 28981439. The next prime is 28981457. The reversal of 28981456 is 65418982.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28981457) 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, 129270 + ... + 129493.

Almost surely, 2^28981456 is an apocalyptic number.

It is an amenable number.

28981456 is an abundant number, since it is smaller than the sum of its proper divisors (35192016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28981456 is a wasteful number, since it uses less digits than its factorization.

28981456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258778 (or 258772 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 28981456 is about 5383.4427646256. The cubic root of 28981456 is about 307.1661823487.

The spelling of 28981456 in words is "twenty-eight million, nine hundred eighty-one thousand, four hundred fifty-six".