640002567 has 8 divisors (see below), whose sum is σ = 853798896. Its totient is φ = 426437312.

The previous prime is 640002563. The next prime is 640002569. The reversal of 640002567 is 765200046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640002567 - 2² = 640002563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640002563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51198 + ... + 62459.

It is an arithmetic number, because the mean of its divisors is an integer number (106724862).

Almost surely, 2^640002567 is an apocalyptic number.

640002567 is a deficient number, since it is larger than the sum of its proper divisors (213796329).

640002567 is a wasteful number, since it uses less digits than its factorization.

640002567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115537.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 640002567 is about 25298.2720160884. The cubic root of 640002567 is about 861.7750281849.

The spelling of 640002567 in words is "six hundred forty million, two thousand, five hundred sixty-seven".