28996538209920 has 192 divisors, whose sum is σ = 103358628771840. Its totient is φ = 7482977556480.

The previous prime is 28996538209909. The next prime is 28996538209937. The reversal of 28996538209920 is 2990283569982.

28996538209920 is a `hidden beast` number, since 2 + 89 + 9 + 6 + 538 + 2 + 0 + 9 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (72).

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 23 ways as a sum of consecutive naturals, for example, 81016944 + ... + 81374063.

It is an arithmetic number, because the mean of its divisors is an integer number (538326191520).

Almost surely, 2^{28996538209920} is an apocalyptic number.

28996538209920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28996538209920 is an abundant number, since it is smaller than the sum of its proper divisors (74362090561920).

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

28996538209920 is a wasteful number, since it uses less digits than its factorization.

28996538209920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162391063 (or 162391048 counting only the distinct ones).

The product of its (nonzero) digits is 302330880, while the sum is 72.

The spelling of 28996538209920 in words is "twenty-eight trillion, nine hundred ninety-six billion, five hundred thirty-eight million, two hundred nine thousand, nine hundred twenty".