28421684 has 6 divisors (see below), whose sum is σ = 49737954. Its totient is φ = 14210840.

The previous prime is 28421681. The next prime is 28421693. The reversal of 28421684 is 48612482.

It can be written as a sum of positive squares in only one way, i.e., 23232400 + 5189284 = 4820^2 + 2278^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28421681) 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, 3552707 + ... + 3552714.

It is an arithmetic number, because the mean of its divisors is an integer number (8289659).

Almost surely, 2^28421684 is an apocalyptic number.

It is an amenable number.

28421684 is a deficient number, since it is larger than the sum of its proper divisors (21316270).

28421684 is a wasteful number, since it uses less digits than its factorization.

28421684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7105425 (or 7105423 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The square root of 28421684 is about 5331.1991146458. The cubic root of 28421684 is about 305.1756902310.

The spelling of 28421684 in words is "twenty-eight million, four hundred twenty-one thousand, six hundred eighty-four".