28780627 has 4 divisors (see below), whose sum is σ = 28803736. Its totient is φ = 28757520.

The previous prime is 28780621. The next prime is 28780637. The reversal of 28780627 is 72608782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28780627 - 2¹¹ = 28778579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28780627.

It is not an unprimeable number, because it can be changed into a prime (28780621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9573 + ... + 12214.

It is an arithmetic number, because the mean of its divisors is an integer number (7200934).

Almost surely, 2^28780627 is an apocalyptic number.

28780627 is a deficient number, since it is larger than the sum of its proper divisors (23109).

28780627 is a wasteful number, since it uses less digits than its factorization.

28780627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23108.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 28780627 is about 5364.7578696526. The cubic root of 28780627 is about 306.4550273896.

The spelling of 28780627 in words is "twenty-eight million, seven hundred eighty thousand, six hundred twenty-seven".