640887301 has 4 divisors (see below), whose sum is σ = 678586572. Its totient is φ = 603188032.

The previous prime is 640887287. The next prime is 640887311. The reversal of 640887301 is 103788046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 324936676 + 315950625 = 18026^2 + 17775^2 .

It is a cyclic number.

It is not a de Polignac number, because 640887301 - 2⁷ = 640887173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640887311) 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, 18849610 + ... + 18849643.

It is an arithmetic number, because the mean of its divisors is an integer number (169646643).

Almost surely, 2^640887301 is an apocalyptic number.

It is an amenable number.

640887301 is a deficient number, since it is larger than the sum of its proper divisors (37699271).

640887301 is a wasteful number, since it uses less digits than its factorization.

640887301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37699270.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 640887301 is about 25315.7520330722. The cubic root of 640887301 is about 862.1719487838.

The spelling of 640887301 in words is "six hundred forty million, eight hundred eighty-seven thousand, three hundred one".