804636 has 72 divisors (see below), whose sum is σ = 2422784. Its totient is φ = 220320.

The previous prime is 804619. The next prime is 804653. The reversal of 804636 is 636408.

It is an interprime number because it is at equal distance from previous prime (804619) and next prime (804653).

It is a congruent number.

It is an unprimeable number.

804636 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7761 + ... + 7863.

2⁸⁰⁴⁶³⁶ 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 804636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1211392).

804636 is an abundant number, since it is smaller than the sum of its proper divisors (1618148).

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

804636 is a wasteful number, since it uses less digits than its factorization.

804636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 804636 is about 897.0150500410. The cubic root of 804636 is about 93.0107514452.

Subtracting from 804636 its sum of digits (27), we obtain a square (804609 = 897²).

The spelling of 804636 in words is "eight hundred four thousand, six hundred thirty-six".