641005977 has 16 divisors (see below), whose sum is σ = 866203520. Its totient is φ = 421604352.

The previous prime is 641005891. The next prime is 641005979. The reversal of 641005977 is 779500146.

It is not a de Polignac number, because 641005977 - 2¹⁰ = 641004953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641005979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81849 + ... + 89337.

It is an arithmetic number, because the mean of its divisors is an integer number (54137720).

Almost surely, 2^641005977 is an apocalyptic number.

It is an amenable number.

641005977 is a deficient number, since it is larger than the sum of its proper divisors (225197543).

641005977 is a wasteful number, since it uses less digits than its factorization.

641005977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7872.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 641005977 is about 25318.0958407223. The cubic root of 641005977 is about 862.2251629256.

The spelling of 641005977 in words is "six hundred forty-one million, five thousand, nine hundred seventy-seven".