811138680 has 192 divisors, whose sum is σ = 3045276000. Its totient is φ = 185057280.

The previous prime is 811138673. The next prime is 811138721. The reversal of 811138680 is 86831118.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61296 + ... + 73344.

Almost surely, 2^811138680 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 811138680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1522638000).

811138680 is an abundant number, since it is smaller than the sum of its proper divisors (2234137320).

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

811138680 is a wasteful number, since it uses less digits than its factorization.

811138680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12094 (or 12087 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 811138680 is about 28480.4964844365. The cubic root of 811138680 is about 932.6063551017.

Adding to 811138680 its reverse (86831118), we get a palindrome (897969798).

The spelling of 811138680 in words is "eight hundred eleven million, one hundred thirty-eight thousand, six hundred eighty".