816291380 has 48 divisors (see below), whose sum is σ = 1873622016. Its totient is φ = 297392640.

The previous prime is 816291361. The next prime is 816291401. The reversal of 816291380 is 83192618.

816291380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28184 + ... + 49263.

It is an arithmetic number, because the mean of its divisors is an integer number (39033792).

Almost surely, 2^816291380 is an apocalyptic number.

It is an amenable number.

816291380 is an abundant number, since it is smaller than the sum of its proper divisors (1057330636).

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

816291380 is a wasteful number, since it uses less digits than its factorization.

816291380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77504 (or 77502 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 816291380 is about 28570.8134290923. The cubic root of 816291380 is about 934.5769598156.

The spelling of 816291380 in words is "eight hundred sixteen million, two hundred ninety-one thousand, three hundred eighty".