28778454 has 24 divisors (see below), whose sum is σ = 62849280. Its totient is φ = 9516528.

The previous prime is 28778441. The next prime is 28778459. The reversal of 28778454 is 45487782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4009 + ... + 8580.

It is an arithmetic number, because the mean of its divisors is an integer number (2618720).

Almost surely, 2^28778454 is an apocalyptic number.

28778454 is an abundant number, since it is smaller than the sum of its proper divisors (34070826).

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

28778454 is a wasteful number, since it uses less digits than its factorization.

28778454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12724 (or 12721 counting only the distinct ones).

The product of its digits is 501760, while the sum is 45.

The square root of 28778454 is about 5364.5553403800. Note that the first 3 decimals coincide. The cubic root of 28778454 is about 306.4473145215.

The spelling of 28778454 in words is "twenty-eight million, seven hundred seventy-eight thousand, four hundred fifty-four".