28670784 has 56 divisors (see below), whose sum is σ = 78321408. Its totient is φ = 9246720.

The previous prime is 28670777. The next prime is 28670813. The reversal of 28670784 is 48707682.

It is a super-3 number, since 3×28670784³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 3544 + ... + 8360.

Almost surely, 2^28670784 is an apocalyptic number.

28670784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28670784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39160704).

28670784 is an abundant number, since it is smaller than the sum of its proper divisors (49650624).

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

28670784 is a wasteful number, since it uses less digits than its factorization.

28670784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4863 (or 4853 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 28670784 is about 5354.5106218963. The cubic root of 28670784 is about 306.0646623143.

The spelling of 28670784 in words is "twenty-eight million, six hundred seventy thousand, seven hundred eighty-four".