228131004 has 12 divisors (see below), whose sum is σ = 532305704. Its totient is φ = 76043664.

The previous prime is 228130979. The next prime is 228131009. The reversal of 228131004 is 400131822.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228131009) 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, 9505447 + ... + 9505470.

Almost surely, 2^228131004 is an apocalyptic number.

It is an amenable number.

228131004 is an abundant number, since it is smaller than the sum of its proper divisors (304174700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228131004 is a wasteful number, since it uses less digits than its factorization.

228131004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19010924 (or 19010922 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 228131004 is about 15104.0062235157. The cubic root of 228131004 is about 611.0284576504.

Adding to 228131004 its reverse (400131822), we get a palindrome (628262826).

The spelling of 228131004 in words is "two hundred twenty-eight million, one hundred thirty-one thousand, four".