811919870 has 32 divisors (see below), whose sum is σ = 1484306208. Its totient is φ = 319707648.

The previous prime is 811919863. The next prime is 811919887. The reversal of 811919870 is 78919118.

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 15 ways as a sum of consecutive naturals, for example, 683417 + ... + 684603.

It is an arithmetic number, because the mean of its divisors is an integer number (46384569).

Almost surely, 2^811919870 is an apocalyptic number.

811919870 is a deficient number, since it is larger than the sum of its proper divisors (672386338).

811919870 is a wasteful number, since it uses less digits than its factorization.

811919870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204.

The product of its (nonzero) digits is 36288, while the sum is 44.

The square root of 811919870 is about 28494.2076569958. The cubic root of 811919870 is about 932.9056499984.

The spelling of 811919870 in words is "eight hundred eleven million, nine hundred nineteen thousand, eight hundred seventy".