28947540820 has 48 divisors (see below), whose sum is σ = 69806520000. Its totient is φ = 9972357120.

The previous prime is 28947540803. The next prime is 28947540841. The reversal of 28947540820 is 2804574982.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3458445 + ... + 3466804.

It is an arithmetic number, because the mean of its divisors is an integer number (1454302500).

Almost surely, 2^28947540820 is an apocalyptic number.

28947540820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28947540820 is an abundant number, since it is smaller than the sum of its proper divisors (40858979180).

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

28947540820 is a wasteful number, since it uses less digits than its factorization.

28947540820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925288 (or 6925286 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 28947540820 in words is "twenty-eight billion, nine hundred forty-seven million, five hundred forty thousand, eight hundred twenty".