228320777 has 4 divisors (see below), whose sum is σ = 240337680. Its totient is φ = 216303876.

The previous prime is 228320723. The next prime is 228320789. The reversal of 228320777 is 777023822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228320777 - 2²² = 224126473 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 228320777.

It is not an unprimeable number, because it can be changed into a prime (228320717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6008423 + ... + 6008460.

It is an arithmetic number, because the mean of its divisors is an integer number (60084420).

Almost surely, 2^228320777 is an apocalyptic number.

It is an amenable number.

228320777 is a deficient number, since it is larger than the sum of its proper divisors (12016903).

228320777 is a wasteful number, since it uses less digits than its factorization.

228320777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12016902.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 228320777 is about 15110.2871250020. The cubic root of 228320777 is about 611.1978406848.

The spelling of 228320777 in words is "two hundred twenty-eight million, three hundred twenty thousand, seven hundred seventy-seven".