28782794 has 4 divisors (see below), whose sum is σ = 43174194. Its totient is φ = 14391396.

The previous prime is 28782791. The next prime is 28782797. The reversal of 28782794 is 49728782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49728782 = 2 ⋅24864391.

It is an interprime number because it is at equal distance from previous prime (28782791) and next prime (28782797).

It can be written as a sum of positive squares in only one way, i.e., 28761769 + 21025 = 5363^2 + 145^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28782791) 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 as a sum of consecutive naturals, namely, 7195697 + ... + 7195700.

Almost surely, 2^28782794 is an apocalyptic number.

28782794 is a deficient number, since it is larger than the sum of its proper divisors (14391400).

28782794 is a wasteful number, since it uses less digits than its factorization.

28782794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14391399.

The product of its digits is 451584, while the sum is 47.

The square root of 28782794 is about 5364.9598320957. The cubic root of 28782794 is about 306.4627185746.

The spelling of 28782794 in words is "twenty-eight million, seven hundred eighty-two thousand, seven hundred ninety-four".