15820656828 has 12 divisors (see below), whose sum is σ = 36914865960. Its totient is φ = 5273552272.

The previous prime is 15820656811. The next prime is 15820656829. The reversal of 15820656828 is 82865602851.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15820656829) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 659194023 + ... + 659194046.

It is an arithmetic number, because the mean of its divisors is an integer number (3076238830).

Almost surely, 2^15820656828 is an apocalyptic number.

It is an amenable number.

15820656828 is an abundant number, since it is smaller than the sum of its proper divisors (21094209132).

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

15820656828 is a wasteful number, since it uses less digits than its factorization.

15820656828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318388076 (or 1318388074 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 51.

The spelling of 15820656828 in words is "fifteen billion, eight hundred twenty million, six hundred fifty-six thousand, eight hundred twenty-eight".