28400543 has 2 divisors, whose sum is σ = 28400544. Its totient is φ = 28400542.

The previous prime is 28400539. The next prime is 28400569. The reversal of 28400543 is 34500482.

It is an a-pointer prime, because the next prime (28400569) can be obtained adding 28400543 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28400543 - 2² = 28400539 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28400503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200271 + 14200272.

It is an arithmetic number, because the mean of its divisors is an integer number (14200272).

Almost surely, 2^28400543 is an apocalyptic number.

28400543 is a deficient number, since it is larger than the sum of its proper divisors (1).

28400543 is an equidigital number, since it uses as much as digits as its factorization.

28400543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 28400543 is about 5329.2159836133. The cubic root of 28400543 is about 305.1000048307.

The spelling of 28400543 in words is "twenty-eight million, four hundred thousand, five hundred forty-three".