801640 has 48 divisors (see below), whose sum is σ = 2103300. Its totient is φ = 274176.

The previous prime is 801631. The next prime is 801641. The reversal of 801640 is 46108.

801640 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 777924 + 23716 = 882^2 + 154^2 .

It is not an unprimeable number, because it can be changed into a prime (801641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1756 + ... + 2164.

2⁸⁰¹⁶⁴⁰ 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 801640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1051650).

801640 is an abundant number, since it is smaller than the sum of its proper divisors (1301660).

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

801640 is a wasteful number, since it uses less digits than its factorization.

801640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 801640 is about 895.3435094979. The cubic root of 801640 is about 92.8951684217.

Adding to 801640 its reverse (46108), we get a palindrome (847748).

It can be divided in two parts, 801 and 640, that added together give a palindrome (1441).

The spelling of 801640 in words is "eight hundred one thousand, six hundred forty".