641296992 has 96 divisors (see below), whose sum is σ = 1951133184. Its totient is φ = 180633600.

The previous prime is 641296963. The next prime is 641297021. The reversal of 641296992 is 299692146.

It is an interprime number because it is at equal distance from previous prime (641296963) and next prime (641297021).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×641296992² = 822523663896496128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 40992 + ... + 54432.

It is an arithmetic number, because the mean of its divisors is an integer number (20324304).

Almost surely, 2^641296992 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 641296992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (975566592).

641296992 is an abundant number, since it is smaller than the sum of its proper divisors (1309836192).

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

641296992 is a wasteful number, since it uses less digits than its factorization.

641296992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13532 (or 13524 counting only the distinct ones).

The product of its digits is 419904, while the sum is 48.

The square root of 641296992 is about 25323.8423624852. The cubic root of 641296992 is about 862.3556258240.

The spelling of 641296992 in words is "six hundred forty-one million, two hundred ninety-six thousand, nine hundred ninety-two".