228434661 has 80 divisors (see below), whose sum is σ = 444939264. Its totient is φ = 113342976.

The previous prime is 228434659. The next prime is 228434677. The reversal of 228434661 is 166434822.

It is not a de Polignac number, because 228434661 - 2¹ = 228434659 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228434561) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 124396 + ... + 126218.

Almost surely, 2^228434661 is an apocalyptic number.

228434661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

228434661 is a deficient number, since it is larger than the sum of its proper divisors (216504603).

228434661 is a wasteful number, since it uses less digits than its factorization.

228434661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872 (or 1863 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 228434661 is about 15114.0550812811. The cubic root of 228434661 is about 611.2994434768.

Subtracting from 228434661 its sum of digits (36), we obtain a triangular number (228434625 = T₂₁₃₇₄).

The spelling of 228434661 in words is "two hundred twenty-eight million, four hundred thirty-four thousand, six hundred sixty-one".