28161441807680 has 56 divisors (see below), whose sum is σ = 67061553102432. Its totient is φ = 11264220641792.

The previous prime is 28161441807581. The next prime is 28161441807689. The reversal of 28161441807680 is 8670814416182.

It is a super-2 number, since 2×28161441807680² (a number of 28 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161441807689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8866019 + ... + 11615901.

It is an arithmetic number, because the mean of its divisors is an integer number (1197527733972).

Almost surely, 2^{28161441807680} is an apocalyptic number.

28161441807680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28161441807680 is an abundant number, since it is smaller than the sum of its proper divisors (38900111294752).

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

28161441807680 is a wasteful number, since it uses less digits than its factorization.

28161441807680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781903 (or 2781893 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 56.

The spelling of 28161441807680 in words is "twenty-eight trillion, one hundred sixty-one billion, four hundred forty-one million, eight hundred seven thousand, six hundred eighty".