28668426 has 16 divisors (see below), whose sum is σ = 60709824. Its totient is φ = 8993984.

The previous prime is 28668421. The next prime is 28668427. The reversal of 28668426 is 62486682.

28668426 = T₁₈₂₈ + T₁₈₂₉ + ... + T₁₈₄₄.

It is not an unprimeable number, because it can be changed into a prime (28668421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140430 + ... + 140633.

It is an arithmetic number, because the mean of its divisors is an integer number (3794364).

Almost surely, 2^28668426 is an apocalyptic number.

28668426 is an abundant number, since it is smaller than the sum of its proper divisors (32041398).

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

28668426 is a wasteful number, since it uses less digits than its factorization.

28668426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281085.

The product of its digits is 221184, while the sum is 42.

The square root of 28668426 is about 5354.2904291792. The cubic root of 28668426 is about 306.0562714234.

The spelling of 28668426 in words is "twenty-eight million, six hundred sixty-eight thousand, four hundred twenty-six".