812501720 has 16 divisors (see below), whose sum is σ = 1828128960. Its totient is φ = 325000672.

The previous prime is 812501707. The next prime is 812501741. The reversal of 812501720 is 27105218.

812501720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 812501720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10156232 + ... + 10156311.

It is an arithmetic number, because the mean of its divisors is an integer number (114258060).

Almost surely, 2^812501720 is an apocalyptic number.

It is an amenable number.

812501720 is an abundant number, since it is smaller than the sum of its proper divisors (1015627240).

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

812501720 is a wasteful number, since it uses less digits than its factorization.

812501720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20312554 (or 20312550 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 812501720 is about 28504.4157982583. The cubic root of 812501720 is about 933.1284476571.

Adding to 812501720 its reverse (27105218), we get a palindrome (839606938).

The spelling of 812501720 in words is "eight hundred twelve million, five hundred one thousand, seven hundred twenty".