28070644906 has 16 divisors (see below), whose sum is σ = 43951017600. Its totient is φ = 13420704528.

The previous prime is 28070644891. The next prime is 28070644907. The reversal of 28070644906 is 60944607082.

It is a happy number.

It is a super-2 number, since 2×28070644906² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (28070644907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44875 + ... + 241153.

It is an arithmetic number, because the mean of its divisors is an integer number (2746938600).

Almost surely, 2^28070644906 is an apocalyptic number.

28070644906 is a deficient number, since it is larger than the sum of its proper divisors (15880372694).

28070644906 is a wasteful number, since it uses less digits than its factorization.

28070644906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199413.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 28070644906 in words is "twenty-eight billion, seventy million, six hundred forty-four thousand, nine hundred six".