28774491 has 8 divisors (see below), whose sum is σ = 38516304. Its totient is φ = 19107840.

The previous prime is 28774469. The next prime is 28774507. The reversal of 28774491 is 19447782.

It is a happy number.

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

It is not a de Polignac number, because 28774491 - 2⁷ = 28774363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28774441) 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 7 ways as a sum of consecutive naturals, for example, 17890 + ... + 19431.

It is an arithmetic number, because the mean of its divisors is an integer number (4814538).

Almost surely, 2^28774491 is an apocalyptic number.

28774491 is a deficient number, since it is larger than the sum of its proper divisors (9741813).

28774491 is a wasteful number, since it uses less digits than its factorization.

28774491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37581.

The product of its digits is 112896, while the sum is 42.

The square root of 28774491 is about 5364.1859587453. The cubic root of 28774491 is about 306.4332472097.

The spelling of 28774491 in words is "twenty-eight million, seven hundred seventy-four thousand, four hundred ninety-one".