28349784 has 32 divisors (see below), whose sum is σ = 78750000. Its totient is φ = 9449856.

The previous prime is 28349759. The next prime is 28349813. The reversal of 28349784 is 48794382.

28349784 is a `hidden beast` number, since 2 + 83 + 497 + 84 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65409 + ... + 65840.

Almost surely, 2^28349784 is an apocalyptic number.

28349784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28349784 is an abundant number, since it is smaller than the sum of its proper divisors (50400216).

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

28349784 is a wasteful number, since it uses less digits than its factorization.

28349784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131264 (or 131254 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28349784 is about 5324.4515210489. The cubic root of 28349784 is about 304.9181326453.

The spelling of 28349784 in words is "twenty-eight million, three hundred forty-nine thousand, seven hundred eighty-four".