28780543 has 8 divisors (see below), whose sum is σ = 31470336. Its totient is φ = 26103000.

The previous prime is 28780519. The next prime is 28780547. The reversal of 28780543 is 34508782.

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

It is not a de Polignac number, because 28780543 - 2¹³ = 28772351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2268 + ... + 7918.

It is an arithmetic number, because the mean of its divisors is an integer number (3933792).

Almost surely, 2^28780543 is an apocalyptic number.

28780543 is a deficient number, since it is larger than the sum of its proper divisors (2689793).

28780543 is a wasteful number, since it uses less digits than its factorization.

28780543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6125.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 28780543 is about 5364.7500407754. The cubic root of 28780543 is about 306.4547292464.

The spelling of 28780543 in words is "twenty-eight million, seven hundred eighty thousand, five hundred forty-three".