810820740 has 48 divisors (see below), whose sum is σ = 2275761600. Its totient is φ = 215698560.

The previous prime is 810820739. The next prime is 810820741. The reversal of 810820740 is 47028018.

It is an interprime number because it is at equal distance from previous prime (810820739) and next prime (810820741).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 810820698 and 810820707.

It is not an unprimeable number, because it can be changed into a prime (810820741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9211 + ... + 41309.

It is an arithmetic number, because the mean of its divisors is an integer number (47411700).

Almost surely, 2^810820740 is an apocalyptic number.

It is an amenable number.

810820740 is an abundant number, since it is smaller than the sum of its proper divisors (1464940860).

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

810820740 is a wasteful number, since it uses less digits than its factorization.

810820740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32532 (or 32530 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 810820740 is about 28474.9142228734. The cubic root of 810820740 is about 932.4844887174.

Adding to 810820740 its reverse (47028018), we get a palindrome (857848758).

The spelling of 810820740 in words is "eight hundred ten million, eight hundred twenty thousand, seven hundred forty".