641004877 has 4 divisors (see below), whose sum is σ = 645898176. Its totient is φ = 636111580.

The previous prime is 641004857. The next prime is 641004901. The reversal of 641004877 is 778400146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 778400146 = 2 ⋅389200073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641004877 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 (641004857) 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, 2446453 + ... + 2446714.

It is an arithmetic number, because the mean of its divisors is an integer number (161474544).

Almost surely, 2^641004877 is an apocalyptic number.

It is an amenable number.

641004877 is a deficient number, since it is larger than the sum of its proper divisors (4893299).

641004877 is a wasteful number, since it uses less digits than its factorization.

641004877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4893298.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 641004877 is about 25318.0741171204. The cubic root of 641004877 is about 862.2246697174.

The spelling of 641004877 in words is "six hundred forty-one million, four thousand, eight hundred seventy-seven".