28002775500020 has 48 divisors (see below), whose sum is σ = 58927480308480. Its totient is φ = 11177959948416.

The previous prime is 28002775500013. The next prime is 28002775500047. The reversal of 28002775500020 is 2000557720082.

It is a super-2 number, since 2×28002775500020² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20190011 + ... + 21532349.

It is an arithmetic number, because the mean of its divisors is an integer number (1227655839760).

Almost surely, 2^{28002775500020} is an apocalyptic number.

28002775500020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28002775500020 is an abundant number, since it is smaller than the sum of its proper divisors (30924704808460).

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

28002775500020 is a wasteful number, since it uses less digits than its factorization.

28002775500020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344504 (or 1344502 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 38.

The spelling of 28002775500020 in words is "twenty-eight trillion, two billion, seven hundred seventy-five million, five hundred thousand, twenty".