820662346428 has 24 divisors (see below), whose sum is σ = 1917113230032. Its totient is φ = 273234912384.

The previous prime is 820662346397. The next prime is 820662346481. The reversal of 820662346428 is 824643266028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39889675 + ... + 39910242.

It is an arithmetic number, because the mean of its divisors is an integer number (79879717918).

Almost surely, 2^820662346428 is an apocalyptic number.

It is an amenable number.

820662346428 is an abundant number, since it is smaller than the sum of its proper divisors (1096450883604).

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

820662346428 is a wasteful number, since it uses less digits than its factorization.

820662346428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79800781 (or 79800779 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 51.

The spelling of 820662346428 in words is "eight hundred twenty billion, six hundred sixty-two million, three hundred forty-six thousand, four hundred twenty-eight".