820991962 has 24 divisors (see below), whose sum is σ = 1456837920. Its totient is φ = 345887640.

The previous prime is 820991959. The next prime is 820991971. The reversal of 820991962 is 269199028.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65214 + ... + 76777.

It is an arithmetic number, because the mean of its divisors is an integer number (60701580).

Almost surely, 2^820991962 is an apocalyptic number.

820991962 is a deficient number, since it is larger than the sum of its proper divisors (635845958).

820991962 is a wasteful number, since it uses less digits than its factorization.

820991962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142066 (or 142059 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 820991962 is about 28652.9572993784. The cubic root of 820991962 is about 936.3674357015.

The spelling of 820991962 in words is "eight hundred twenty million, nine hundred ninety-one thousand, nine hundred sixty-two".