813845720 has 32 divisors (see below), whose sum is σ = 1832144400. Its totient is φ = 325362048.

The previous prime is 813845719. The next prime is 813845737. The reversal of 813845720 is 27548318.

It is a super-3 number, since 3×813845720³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89546 + ... + 98214.

Almost surely, 2^813845720 is an apocalyptic number.

It is an amenable number.

813845720 is an abundant number, since it is smaller than the sum of its proper divisors (1018298680).

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

813845720 is a wasteful number, since it uses less digits than its factorization.

813845720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11027 (or 11023 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 813845720 is about 28527.9813516484. The cubic root of 813845720 is about 933.6426758054.

The spelling of 813845720 in words is "eight hundred thirteen million, eight hundred forty-five thousand, seven hundred twenty".