28781954 has 8 divisors (see below), whose sum is σ = 44091648. Its totient is φ = 14084740.

The previous prime is 28781953. The next prime is 28781971. The reversal of 28781954 is 45918782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28781953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153002 + ... + 153189.

It is an arithmetic number, because the mean of its divisors is an integer number (5511456).

Almost surely, 2^28781954 is an apocalyptic number.

28781954 is a deficient number, since it is larger than the sum of its proper divisors (15309694).

28781954 is a wasteful number, since it uses less digits than its factorization.

28781954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306240.

The product of its digits is 161280, while the sum is 44.

The square root of 28781954 is about 5364.8815457566. The cubic root of 28781954 is about 306.4597372658.

The spelling of 28781954 in words is "twenty-eight million, seven hundred eighty-one thousand, nine hundred fifty-four".