228625918 has 4 divisors (see below), whose sum is σ = 342938880. Its totient is φ = 114312958.

The previous prime is 228625913. The next prime is 228625927. The reversal of 228625918 is 819526822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 819526822 = 2 ⋅409763411.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228625913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57156478 + ... + 57156481.

It is an arithmetic number, because the mean of its divisors is an integer number (85734720).

Almost surely, 2^228625918 is an apocalyptic number.

228625918 is a deficient number, since it is larger than the sum of its proper divisors (114312962).

228625918 is a wasteful number, since it uses less digits than its factorization.

228625918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114312961.

The product of its digits is 138240, while the sum is 43.

The square root of 228625918 is about 15120.3808814461. The cubic root of 228625918 is about 611.4699994441.

The spelling of 228625918 in words is "two hundred twenty-eight million, six hundred twenty-five thousand, nine hundred eighteen".