28055452521720 has 512 divisors, whose sum is σ = 93719047968000. Its totient is φ = 6674032558080.

The previous prime is 28055452521697. The next prime is 28055452521743. The reversal of 28055452521720 is 2712525455082.

It is an interprime number because it is at equal distance from previous prime (28055452521697) and next prime (28055452521743).

It is a self number, because there is not a number n which added to its sum of digits gives 28055452521720.

It is a congruent number.

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, 16809737046 + ... + 16809738714.

Almost surely, 2^{28055452521720} is an apocalyptic number.

28055452521720 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 28055452521720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46859523984000).

28055452521720 is an abundant number, since it is smaller than the sum of its proper divisors (65663595446280).

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

28055452521720 is a wasteful number, since it uses less digits than its factorization.

28055452521720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3523 (or 3519 counting only the distinct ones).

The product of its (nonzero) digits is 2240000, while the sum is 48.

The spelling of 28055452521720 in words is "twenty-eight trillion, fifty-five billion, four hundred fifty-two million, five hundred twenty-one thousand, seven hundred twenty".