28636855441840 has 20 divisors (see below), whose sum is σ = 66580688902464. Its totient is φ = 11454742176704.

The previous prime is 28636855441783. The next prime is 28636855441849. The reversal of 28636855441840 is 4814455863682.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (28636855441849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178980346432 + ... + 178980346591.

Almost surely, 2^{28636855441840} is an apocalyptic number.

28636855441840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28636855441840 is an abundant number, since it is smaller than the sum of its proper divisors (37943833460624).

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

28636855441840 is a wasteful number, since it uses less digits than its factorization.

28636855441840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357960693036 (or 357960693030 counting only the distinct ones).

The product of its (nonzero) digits is 176947200, while the sum is 64.

The spelling of 28636855441840 in words is "twenty-eight trillion, six hundred thirty-six billion, eight hundred fifty-five million, four hundred forty-one thousand, eight hundred forty".