28251153731220 has 144 divisors (see below), whose sum is σ = 93975874755840. Its totient is φ = 6320014907136.

The previous prime is 28251153731167. The next prime is 28251153731231. The reversal of 28251153731220 is 2213735115282.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102087735 + ... + 102364094.

It is an arithmetic number, because the mean of its divisors is an integer number (652610241360).

Almost surely, 2^{28251153731220} is an apocalyptic number.

28251153731220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28251153731220 is an abundant number, since it is smaller than the sum of its proper divisors (65724721024620).

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

28251153731220 is a wasteful number, since it uses less digits than its factorization.

28251153731220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204451902 (or 204451893 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 28251153731220 in words is "twenty-eight trillion, two hundred fifty-one billion, one hundred fifty-three million, seven hundred thirty-one thousand, two hundred twenty".