28520335016400 has 120 divisors (see below), whose sum is σ = 91907207187264. Its totient is φ = 7559881164800.

The previous prime is 28520335016347. The next prime is 28520335016417. The reversal of 28520335016400 is 461053302582.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 70958121 + ... + 71358920.

Almost surely, 2^{28520335016400} is an apocalyptic number.

28520335016400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28520335016400 is an abundant number, since it is smaller than the sum of its proper divisors (63386872170864).

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

28520335016400 is a wasteful number, since it uses less digits than its factorization.

28520335016400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142317229 (or 142317218 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 28520335016400 its reverse (461053302582), we get a palindrome (28981388318982).

The spelling of 28520335016400 in words is "twenty-eight trillion, five hundred twenty billion, three hundred thirty-five million, sixteen thousand, four hundred".