28226216357840 has 40 divisors (see below), whose sum is σ = 65702888657448. Its totient is φ = 11277250306560.

The previous prime is 28226216357803. The next prime is 28226216357909. The reversal of 28226216357840 is 4875361262282.

It can be written as a sum of positive squares in 4 ways, for example, as 1971373251136 + 26254843106704 = 1404056^2 + 5123948^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 206747531 + ... + 206884010.

Almost surely, 2^{28226216357840} is an apocalyptic number.

28226216357840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28226216357840 is an abundant number, since it is smaller than the sum of its proper divisors (37476672299608).

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

28226216357840 is a wasteful number, since it uses less digits than its factorization.

28226216357840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413632407 (or 413632401 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 56.

The spelling of 28226216357840 in words is "twenty-eight trillion, two hundred twenty-six billion, two hundred sixteen million, three hundred fifty-seven thousand, eight hundred forty".