641888007 has 4 divisors (see below), whose sum is σ = 855850680. Its totient is φ = 427925336.

The previous prime is 641887999. The next prime is 641888011. The reversal of 641888007 is 700888146.

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 641888007 - 2³ = 641887999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641888007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641888017) 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, 106981332 + ... + 106981337.

It is an arithmetic number, because the mean of its divisors is an integer number (213962670).

Almost surely, 2^641888007 is an apocalyptic number.

641888007 is a deficient number, since it is larger than the sum of its proper divisors (213962673).

641888007 is a wasteful number, since it uses less digits than its factorization.

641888007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213962672.

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 641888007 is about 25335.5088166786. The cubic root of 641888007 is about 862.6204582021.

The spelling of 641888007 in words is "six hundred forty-one million, eight hundred eighty-eight thousand, seven".