812181270 has 32 divisors (see below), whose sum is σ = 1951165440. Its totient is φ = 216367200.

The previous prime is 812181233. The next prime is 812181301. The reversal of 812181270 is 72181218.

It is a happy number.

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

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18651 + ... + 44409.

It is an arithmetic number, because the mean of its divisors is an integer number (60973920).

Almost surely, 2^812181270 is an apocalyptic number.

812181270 is an abundant number, since it is smaller than the sum of its proper divisors (1138984170).

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

812181270 is a wasteful number, since it uses less digits than its factorization.

812181270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26820.

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 812181270 is about 28498.7941850177. The cubic root of 812181270 is about 933.0057564990.

The spelling of 812181270 in words is "eight hundred twelve million, one hundred eighty-one thousand, two hundred seventy".