228130557 has 4 divisors (see below), whose sum is σ = 304174080. Its totient is φ = 152087036.

The previous prime is 228130547. The next prime is 228130579. The reversal of 228130557 is 755031822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228130557 - 2²² = 223936253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228130547) 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, 38021757 + ... + 38021762.

It is an arithmetic number, because the mean of its divisors is an integer number (76043520).

Almost surely, 2^228130557 is an apocalyptic number.

It is an amenable number.

228130557 is a deficient number, since it is larger than the sum of its proper divisors (76043523).

228130557 is an equidigital number, since it uses as much as digits as its factorization.

228130557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76043522.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 228130557 is about 15103.9914261099. The cubic root of 228130557 is about 611.0280585670.

The spelling of 228130557 in words is "two hundred twenty-eight million, one hundred thirty thousand, five hundred fifty-seven".