987564399 has 4 divisors (see below), whose sum is σ = 1316752536. Its totient is φ = 658376264.

The previous prime is 987564397. The next prime is 987564437. The reversal of 987564399 is 993465789.

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 987564399 - 2¹ = 987564397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987564397) 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, 164594064 + ... + 164594069.

It is an arithmetic number, because the mean of its divisors is an integer number (329188134).

Almost surely, 2^987564399 is an apocalyptic number.

987564399 is a deficient number, since it is larger than the sum of its proper divisors (329188137).

987564399 is a wasteful number, since it uses less digits than its factorization.

987564399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329188136.

The product of its digits is 14696640, while the sum is 60.

The square root of 987564399 is about 31425.5373701071. The cubic root of 987564399 is about 995.8374972782.

The spelling of 987564399 in words is "nine hundred eighty-seven million, five hundred sixty-four thousand, three hundred ninety-nine".