640414887 has 16 divisors (see below), whose sum is σ = 976998912. Its totient is φ = 365528160.

The previous prime is 640414883. The next prime is 640414891. The reversal of 640414887 is 788414046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (640414883) and next prime (640414891).

It is not a de Polignac number, because 640414887 - 2² = 640414883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640414883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1437 + ... + 35817.

It is an arithmetic number, because the mean of its divisors is an integer number (61062432).

Almost surely, 2^640414887 is an apocalyptic number.

640414887 is a deficient number, since it is larger than the sum of its proper divisors (336584025).

640414887 is a wasteful number, since it uses less digits than its factorization.

640414887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35278.

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 640414887 is about 25306.4198771774. The cubic root of 640414887 is about 861.9600539015.

The spelling of 640414887 in words is "six hundred forty million, four hundred fourteen thousand, eight hundred eighty-seven".