28378785 has 16 divisors (see below), whose sum is σ = 45766656. Its totient is φ = 15015168.

The previous prime is 28378781. The next prime is 28378787. The reversal of 28378785 is 58787382.

It is not a de Polignac number, because 28378785 - 2² = 28378781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28378781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5544 + ... + 9353.

It is an arithmetic number, because the mean of its divisors is an integer number (2860416).

Almost surely, 2^28378785 is an apocalyptic number.

It is an amenable number.

28378785 is a deficient number, since it is larger than the sum of its proper divisors (17387871).

28378785 is a wasteful number, since it uses less digits than its factorization.

28378785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15032.

The product of its digits is 752640, while the sum is 48.

The square root of 28378785 is about 5327.1742040222. The cubic root of 28378785 is about 305.0220713222.

The spelling of 28378785 in words is "twenty-eight million, three hundred seventy-eight thousand, seven hundred eighty-five".