223128235987 has 16 divisors (see below), whose sum is σ = 234125210880. Its totient is φ = 212373252000.

The previous prime is 223128235963. The next prime is 223128236027. The reversal of 223128235987 is 789532821322.

It is a cyclic number.

It is not a de Polignac number, because 223128235987 - 2¹⁵ = 223128203219 is a prime.

It is a super-3 number, since 3×223128235987³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223128235937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379168 + ... + 768130.

It is an arithmetic number, because the mean of its divisors is an integer number (14632825680).

Almost surely, 2^223128235987 is an apocalyptic number.

223128235987 is a deficient number, since it is larger than the sum of its proper divisors (10996974893).

223128235987 is a wasteful number, since it uses less digits than its factorization.

223128235987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389274.

The product of its digits is 2903040, while the sum is 52.

The spelling of 223128235987 in words is "two hundred twenty-three billion, one hundred twenty-eight million, two hundred thirty-five thousand, nine hundred eighty-seven".