264487987 has 4 divisors (see below), whose sum is σ = 265541976. Its totient is φ = 263434000.

The previous prime is 264487981. The next prime is 264487991. The reversal of 264487987 is 789784462.

It is a happy number.

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 264487987 - 2²³ = 256099379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264487981) 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, 526618 + ... + 527119.

It is an arithmetic number, because the mean of its divisors is an integer number (66385494).

Almost surely, 2^264487987 is an apocalyptic number.

264487987 is a deficient number, since it is larger than the sum of its proper divisors (1053989).

264487987 is a wasteful number, since it uses less digits than its factorization.

264487987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053988.

The product of its digits is 5419008, while the sum is 55.

The square root of 264487987 is about 16263.0866381508. The cubic root of 264487987 is about 641.9018840881.

The spelling of 264487987 in words is "two hundred sixty-four million, four hundred eighty-seven thousand, nine hundred eighty-seven".