641969796 has 96 divisors (see below), whose sum is σ = 1727308800. Its totient is φ = 183911040.

The previous prime is 641969753. The next prime is 641969803. The reversal of 641969796 is 697969146.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173041 + ... + 176711.

It is an arithmetic number, because the mean of its divisors is an integer number (17992800).

Almost surely, 2^641969796 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641969796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (863654400).

641969796 is an abundant number, since it is smaller than the sum of its proper divisors (1085339004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641969796 is a wasteful number, since it uses less digits than its factorization.

641969796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3769 (or 3767 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 57.

The square root of 641969796 is about 25337.1228832320. The cubic root of 641969796 is about 862.6570948466.

The spelling of 641969796 in words is "six hundred forty-one million, nine hundred sixty-nine thousand, seven hundred ninety-six".