28781395 has 16 divisors (see below), whose sum is σ = 36391680. Its totient is φ = 21808864.

The previous prime is 28781387. The next prime is 28781429. The reversal of 28781395 is 59318782.

It is a cyclic number.

It is not a de Polignac number, because 28781395 - 2³ = 28781387 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11136 + ... + 13474.

It is an arithmetic number, because the mean of its divisors is an integer number (2274480).

Almost surely, 2^28781395 is an apocalyptic number.

28781395 is a deficient number, since it is larger than the sum of its proper divisors (7610285).

28781395 is a wasteful number, since it uses less digits than its factorization.

28781395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2474.

The product of its digits is 120960, while the sum is 43.

The square root of 28781395 is about 5364.8294474289. The cubic root of 28781395 is about 306.4577532437.

The spelling of 28781395 in words is "twenty-eight million, seven hundred eighty-one thousand, three hundred ninety-five".