812155710 has 16 divisors (see below), whose sum is σ = 1949173776. Its totient is φ = 216574848.

The previous prime is 812155657. The next prime is 812155711. The reversal of 812155710 is 17551218.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 27071857 = 812155710 / (8 + 1 + 2 + 1 + 5 + 5 + 7 + 1 + 0).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812155711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13535899 + ... + 13535958.

It is an arithmetic number, because the mean of its divisors is an integer number (121823361).

Almost surely, 2^812155710 is an apocalyptic number.

812155710 is an abundant number, since it is smaller than the sum of its proper divisors (1137018066).

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

812155710 is a wasteful number, since it uses less digits than its factorization.

812155710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27071867.

The product of its (nonzero) digits is 2800, while the sum is 30.

The square root of 812155710 is about 28498.3457414637. The cubic root of 812155710 is about 932.9959689150.

The spelling of 812155710 in words is "eight hundred twelve million, one hundred fifty-five thousand, seven hundred ten".