223128487 has 4 divisors (see below), whose sum is σ = 223431160. Its totient is φ = 222825816.

The previous prime is 223128473. The next prime is 223128509. The reversal of 223128487 is 784821322.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 223128487 - 2¹¹ = 223126439 is a prime.

It is a super-3 number, since 3×223128487³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223128427) 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, 150228 + ... + 151705.

It is an arithmetic number, because the mean of its divisors is an integer number (55857790).

Almost surely, 2^223128487 is an apocalyptic number.

223128487 is a deficient number, since it is larger than the sum of its proper divisors (302673).

223128487 is an equidigital number, since it uses as much as digits as its factorization.

223128487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302672.

The product of its digits is 43008, while the sum is 37.

The square root of 223128487 is about 14937.4859665206. The cubic root of 223128487 is about 606.5291436792.

The spelling of 223128487 in words is "two hundred twenty-three million, one hundred twenty-eight thousand, four hundred eighty-seven".