28780427 has 8 divisors (see below), whose sum is σ = 31043376. Its totient is φ = 26524512.

The previous prime is 28780417. The next prime is 28780463. The reversal of 28780427 is 72408782.

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 28780427 - 2¹⁸ = 28518283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28780417) 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, 9413 + ... + 12089.

It is an arithmetic number, because the mean of its divisors is an integer number (3880422).

Almost surely, 2^28780427 is an apocalyptic number.

28780427 is a deficient number, since it is larger than the sum of its proper divisors (2262949).

28780427 is a wasteful number, since it uses less digits than its factorization.

28780427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28780427 is about 5364.7392294500. The cubic root of 28780427 is about 306.4543175238.

The spelling of 28780427 in words is "twenty-eight million, seven hundred eighty thousand, four hundred twenty-seven".