813720 has 32 divisors (see below), whose sum is σ = 2441520. Its totient is φ = 216960.

The previous prime is 813707. The next prime is 813721. The reversal of 813720 is 27318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3271 + ... + 3510.

2⁸¹³⁷²⁰ is an apocalyptic number.

It is an amenable number.

813720 is an abundant number, since it is smaller than the sum of its proper divisors (1627800).

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

813720 is a wasteful number, since it uses less digits than its factorization.

813720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6795 (or 6791 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 813720 is about 902.0642992603. The cubic root of 813720 is about 93.3594598060.

The spelling of 813720 in words is "eight hundred thirteen thousand, seven hundred twenty".