228779731 has 4 divisors (see below), whose sum is σ = 228926200. Its totient is φ = 228633264.

The previous prime is 228779717. The next prime is 228779797. The reversal of 228779731 is 137977822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137977822 = 2 ⋅68988911.

It is a cyclic number.

It is not a de Polignac number, because 228779731 - 2⁵ = 228779699 is a prime.

It is a super-2 number, since 2×228779731² = 104680330632864722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228779711) 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, 70866 + ... + 74023.

It is an arithmetic number, because the mean of its divisors is an integer number (57231550).

Almost surely, 2^228779731 is an apocalyptic number.

228779731 is a deficient number, since it is larger than the sum of its proper divisors (146469).

228779731 is a wasteful number, since it uses less digits than its factorization.

228779731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146468.

The product of its digits is 296352, while the sum is 46.

The square root of 228779731 is about 15125.4663068614. The cubic root of 228779731 is about 611.6070952320.

The spelling of 228779731 in words is "two hundred twenty-eight million, seven hundred seventy-nine thousand, seven hundred thirty-one".