811142380 has 48 divisors (see below), whose sum is σ = 1788272640. Its totient is φ = 308462528.

The previous prime is 811142377. The next prime is 811142459. The reversal of 811142380 is 83241118.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 71541 + ... + 82099.

It is an arithmetic number, because the mean of its divisors is an integer number (37255680).

Almost surely, 2^811142380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811142380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894136320).

811142380 is an abundant number, since it is smaller than the sum of its proper divisors (977130260).

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

811142380 is a wasteful number, since it uses less digits than its factorization.

811142380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10758 (or 10756 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 811142380 is about 28480.5614410952. The cubic root of 811142380 is about 932.6077731240.

Adding to 811142380 its reverse (83241118), we get a palindrome (894383498).

The spelling of 811142380 in words is "eight hundred eleven million, one hundred forty-two thousand, three hundred eighty".