228322731 has 16 divisors (see below), whose sum is σ = 374683904. Its totient is φ = 120433824.

The previous prime is 228322711. The next prime is 228322741. The reversal of 228322731 is 137223822.

It is not a de Polignac number, because 228322731 - 2¹⁸ = 228060587 is a prime.

It is a super-2 number, since 2×228322731² = 104262538982596722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228322711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417901 + ... + 418446.

It is an arithmetic number, because the mean of its divisors is an integer number (23417744).

Almost surely, 2^228322731 is an apocalyptic number.

228322731 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

228322731 is a deficient number, since it is larger than the sum of its proper divisors (146361173).

228322731 is a wasteful number, since it uses less digits than its factorization.

228322731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836370.

The product of its digits is 8064, while the sum is 30.

The square root of 228322731 is about 15110.3517828011. The cubic root of 228322731 is about 611.1995842511.

The spelling of 228322731 in words is "two hundred twenty-eight million, three hundred twenty-two thousand, seven hundred thirty-one".