28651220299680 has 768 divisors, whose sum is σ = 100888898568192. Its totient is φ = 6776469504000.

The previous prime is 28651220299631. The next prime is 28651220299699. The reversal of 28651220299680 is 8699202215682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 34897953670 + ... + 34897954490.

It is an arithmetic number, because the mean of its divisors is an integer number (131365753344).

Almost surely, 2^{28651220299680} is an apocalyptic number.

28651220299680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28651220299680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50444449284096).

28651220299680 is an abundant number, since it is smaller than the sum of its proper divisors (72237678268512).

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

28651220299680 is a wasteful number, since it uses less digits than its factorization.

28651220299680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781 (or 1773 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 28651220299680 in words is "twenty-eight trillion, six hundred fifty-one billion, two hundred twenty million, two hundred ninety-nine thousand, six hundred eighty".