641992 has 16 divisors (see below), whose sum is σ = 1296540. Its totient is φ = 296256.

The previous prime is 641981. The next prime is 642011. The reversal of 641992 is 299146.

It is a happy number.

641992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 470596 + 171396 = 686^2 + 414^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2983 + ... + 3190.

2⁶⁴¹⁹⁹² is an apocalyptic number.

It is an amenable number.

641992 is an abundant number, since it is smaller than the sum of its proper divisors (654548).

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

641992 is a wasteful number, since it uses less digits than its factorization.

641992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6192 (or 6188 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 641992 is about 801.2440327391. The cubic root of 641992 is about 86.2667040391.

The spelling of 641992 in words is "six hundred forty-one thousand, nine hundred ninety-two".