28764356820 has 24 divisors (see below), whose sum is σ = 80540199264. Its totient is φ = 7670495136.

The previous prime is 28764356791. The next prime is 28764356821. The reversal of 28764356820 is 2865346782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28764356821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239702914 + ... + 239703033.

It is an arithmetic number, because the mean of its divisors is an integer number (3355841636).

Almost surely, 2^28764356820 is an apocalyptic number.

28764356820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28764356820 is an abundant number, since it is smaller than the sum of its proper divisors (51775842444).

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

28764356820 is a wasteful number, since it uses less digits than its factorization.

28764356820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479405959 (or 479405957 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 28764356820 in words is "twenty-eight billion, seven hundred sixty-four million, three hundred fifty-six thousand, eight hundred twenty".