28281819212120 has 32 divisors (see below), whose sum is σ = 63801993243600. Its totient is φ = 11282878793088.

The previous prime is 28281819212111. The next prime is 28281819212159. The reversal of 28281819212120 is 2121291818282.

It is a super-2 number, since 2×28281819212120² (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 7 ways as a sum of consecutive naturals, for example, 932762519 + ... + 932792838.

Almost surely, 2^{28281819212120} is an apocalyptic number.

28281819212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28281819212120 is an abundant number, since it is smaller than the sum of its proper divisors (35520174031480).

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

28281819212120 is a wasteful number, since it uses less digits than its factorization.

28281819212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865555747 (or 1865555743 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 47.

The spelling of 28281819212120 in words is "twenty-eight trillion, two hundred eighty-one billion, eight hundred nineteen million, two hundred twelve thousand, one hundred twenty".