228640395 has 64 divisors (see below), whose sum is σ = 418037760. Its totient is φ = 105984000.

The previous prime is 228640393. The next prime is 228640481. The reversal of 228640395 is 593046822.

It is a happy number.

It is not a de Polignac number, because 228640395 - 2¹ = 228640393 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (228640393) 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 63 ways as a sum of consecutive naturals, for example, 198070 + ... + 199220.

It is an arithmetic number, because the mean of its divisors is an integer number (6531840).

Almost surely, 2^228640395 is an apocalyptic number.

228640395 is a deficient number, since it is larger than the sum of its proper divisors (189397365).

228640395 is a wasteful number, since it uses less digits than its factorization.

228640395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 228640395 is about 15120.8595985810. The cubic root of 228640395 is about 611.4829056279.

The spelling of 228640395 in words is "two hundred twenty-eight million, six hundred forty thousand, three hundred ninety-five".