264401687 has 4 divisors (see below), whose sum is σ = 288438216. Its totient is φ = 240365160.

The previous prime is 264401653. The next prime is 264401689. The reversal of 264401687 is 786104462.

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 264401687 - 2¹² = 264397591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 264401687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264401689) 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, 12018248 + ... + 12018269.

It is an arithmetic number, because the mean of its divisors is an integer number (72109554).

Almost surely, 2^264401687 is an apocalyptic number.

264401687 is a deficient number, since it is larger than the sum of its proper divisors (24036529).

264401687 is a wasteful number, since it uses less digits than its factorization.

264401687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24036528.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 264401687 is about 16260.4331738118. The cubic root of 264401687 is about 641.8320609310.

The spelling of 264401687 in words is "two hundred sixty-four million, four hundred one thousand, six hundred eighty-seven".