811988052 has 48 divisors (see below), whose sum is σ = 1986882240. Its totient is φ = 257741568.

The previous prime is 811988039. The next prime is 811988057. The reversal of 811988052 is 250889118.

It is a junction number, because it is equal to n+sod(n) for n = 811987995 and 811988013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811988057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9423 + ... + 41385.

It is an arithmetic number, because the mean of its divisors is an integer number (41393380).

Almost surely, 2^811988052 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 811988052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993441120).

811988052 is an abundant number, since it is smaller than the sum of its proper divisors (1174894188).

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

811988052 is a wasteful number, since it uses less digits than its factorization.

811988052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32072 (or 32070 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 42.

The square root of 811988052 is about 28495.4040504780. The cubic root of 811988052 is about 932.9317632455.

The spelling of 811988052 in words is "eight hundred eleven million, nine hundred eighty-eight thousand, fifty-two".