987564123 has 32 divisors (see below), whose sum is σ = 1800691200. Its totient is φ = 520911648.

The previous prime is 987564107. The next prime is 987564131. The reversal of 987564123 is 321465789.

987564123 is a `hidden beast` number, since 9 + 87 + 564 + 1 + 2 + 3 = 666.

It is not a de Polignac number, because 987564123 - 2⁴ = 987564107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (987564223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198513 + ... + 203426.

It is an arithmetic number, because the mean of its divisors is an integer number (56271600).

Almost surely, 2^987564123 is an apocalyptic number.

987564123 is a deficient number, since it is larger than the sum of its proper divisors (813127077).

987564123 is a wasteful number, since it uses less digits than its factorization.

987564123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401968 (or 401962 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 987564123 is about 31425.5329787738. The cubic root of 987564123 is about 995.8374045075.

The spelling of 987564123 in words is "nine hundred eighty-seven million, five hundred sixty-four thousand, one hundred twenty-three".