28467021 has 16 divisors (see below), whose sum is σ = 42743808. Its totient is φ = 16695600.

The previous prime is 28467017. The next prime is 28467121. The reversal of 28467021 is 12076482.

It is not a de Polignac number, because 28467021 - 2² = 28467017 is a prime.

It is a super-2 number, since 2×28467021² = 1620742569228882, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28467021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28467011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12891 + ... + 14936.

It is an arithmetic number, because the mean of its divisors is an integer number (2671488).

Almost surely, 2^28467021 is an apocalyptic number.

It is an amenable number.

28467021 is a deficient number, since it is larger than the sum of its proper divisors (14276787).

28467021 is a wasteful number, since it uses less digits than its factorization.

28467021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27872.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28467021 is about 5335.4494656027. The cubic root of 28467021 is about 305.3378715671.

The spelling of 28467021 in words is "twenty-eight million, four hundred sixty-seven thousand, twenty-one".