811549380 has 48 divisors (see below), whose sum is σ = 2283906240. Its totient is φ = 215311488.

The previous prime is 811549327. The next prime is 811549381. The reversal of 811549380 is 83945118.

It is a super-2 number, since 2×811549380² = 1317224792356768800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (811549381) by changing a digit.

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, 22510 + ... + 46149.

It is an arithmetic number, because the mean of its divisors is an integer number (47581380).

Almost surely, 2^811549380 is an apocalyptic number.

It is an amenable number.

811549380 is an abundant number, since it is smaller than the sum of its proper divisors (1472356860).

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

811549380 is a wasteful number, since it uses less digits than its factorization.

811549380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68868 (or 68866 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 811549380 is about 28487.7057693314. The cubic root of 811549380 is about 932.7637292611.

The spelling of 811549380 in words is "eight hundred eleven million, five hundred forty-nine thousand, three hundred eighty".