287228113 has 4 divisors (see below), whose sum is σ = 296493568. Its totient is φ = 277962660.

The previous prime is 287228087. The next prime is 287228119. The reversal of 287228113 is 311822782.

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, and also an emirpimes, since its reverse is a distinct semiprime: 311822782 = 2 ⋅155911391.

It is a cyclic number.

It is not a de Polignac number, because 287228113 - 2²¹ = 285130961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287228119) 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, 4632681 + ... + 4632742.

It is an arithmetic number, because the mean of its divisors is an integer number (74123392).

Almost surely, 2^287228113 is an apocalyptic number.

It is an amenable number.

287228113 is a deficient number, since it is larger than the sum of its proper divisors (9265455).

287228113 is an equidigital number, since it uses as much as digits as its factorization.

287228113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9265454.

The product of its digits is 10752, while the sum is 34.

The square root of 287228113 is about 16947.8055511621. The cubic root of 287228113 is about 659.7949416527.

The spelling of 287228113 in words is "two hundred eighty-seven million, two hundred twenty-eight thousand, one hundred thirteen".