804640 has 48 divisors (see below), whose sum is σ = 1959552. Its totient is φ = 312064.

The previous prime is 804619. The next prime is 804653. The reversal of 804640 is 46408.

804640 = T₈₁ + T₈₂ + ... + T₁₇₄.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7467 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (40824).

2⁸⁰⁴⁶⁴⁰ is an apocalyptic number.

804640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 804640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979776).

804640 is an abundant number, since it is smaller than the sum of its proper divisors (1154912).

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

804640 is a wasteful number, since it uses less digits than its factorization.

804640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 804640 is about 897.0172796552. The cubic root of 804640 is about 93.0109055697.

It can be divided in two parts, 804 and 640, that added together give a square (1444 = 38²).

The spelling of 804640 in words is "eight hundred four thousand, six hundred forty".