228818691 has 24 divisors (see below), whose sum is σ = 368381520. Its totient is φ = 136014336.

The previous prime is 228818683. The next prime is 228818699. The reversal of 228818691 is 196818822.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (228818683) and next prime (228818699).

It is not a de Polignac number, because 228818691 - 2³ = 228818683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228818699) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36450 + ... + 42263.

It is an arithmetic number, because the mean of its divisors is an integer number (15349230).

Almost surely, 2^228818691 is an apocalyptic number.

228818691 is a deficient number, since it is larger than the sum of its proper divisors (139562829).

228818691 is a wasteful number, since it uses less digits than its factorization.

228818691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78755 (or 78752 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 228818691 is about 15126.7541462139. The cubic root of 228818691 is about 611.6418110987.

The spelling of 228818691 in words is "two hundred twenty-eight million, eight hundred eighteen thousand, six hundred ninety-one".