264563987 has 12 divisors (see below), whose sum is σ = 273117600. Its totient is φ = 256160016.

The previous prime is 264563983. The next prime is 264564007. The reversal of 264563987 is 789365462.

It is a happy number.

It is not a de Polignac number, because 264563987 - 2² = 264563983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264563983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 757889 + ... + 758237.

It is an arithmetic number, because the mean of its divisors is an integer number (22759800).

Almost surely, 2^264563987 is an apocalyptic number.

264563987 is a deficient number, since it is larger than the sum of its proper divisors (8553613).

264563987 is an equidigital number, since it uses as much as digits as its factorization.

264563987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 523 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 50.

The square root of 264563987 is about 16265.4230501392. The cubic root of 264563987 is about 641.9633611981.

The spelling of 264563987 in words is "two hundred sixty-four million, five hundred sixty-three thousand, nine hundred eighty-seven".