28851421 has 8 divisors (see below), whose sum is σ = 29965824. Its totient is φ = 27748560.

The previous prime is 28851391. The next prime is 28851437. The reversal of 28851421 is 12415882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28851421 - 2⁷ = 28851293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28851461) 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, 2391 + ... + 7963.

It is an arithmetic number, because the mean of its divisors is an integer number (3745728).

Almost surely, 2^28851421 is an apocalyptic number.

It is an amenable number.

28851421 is a deficient number, since it is larger than the sum of its proper divisors (1114403).

28851421 is a wasteful number, since it uses less digits than its factorization.

28851421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771.

The product of its digits is 5120, while the sum is 31.

The square root of 28851421 is about 5371.3518782519. The cubic root of 28851421 is about 306.7060922584.

The spelling of 28851421 in words is "twenty-eight million, eight hundred fifty-one thousand, four hundred twenty-one".