811421670 has 16 divisors (see below), whose sum is σ = 1947412080. Its totient is φ = 216379104.

The previous prime is 811421659. The next prime is 811421701. The reversal of 811421670 is 76124118.

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: 27047389 = 811421670 / (8 + 1 + 1 + 4 + 2 + 1 + 6 + 7 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13523665 + ... + 13523724.

It is an arithmetic number, because the mean of its divisors is an integer number (121713255).

Almost surely, 2^811421670 is an apocalyptic number.

811421670 is an abundant number, since it is smaller than the sum of its proper divisors (1135990410).

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

811421670 is a wasteful number, since it uses less digits than its factorization.

811421670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27047399.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 811421670 is about 28485.4641878977. The cubic root of 811421670 is about 932.7147983691.

Adding to 811421670 its reverse (76124118), we get a palindrome (887545788).

The spelling of 811421670 in words is "eight hundred eleven million, four hundred twenty-one thousand, six hundred seventy".