28207979798 has 8 divisors (see below), whose sum is σ = 42380326920. Its totient is φ = 14081204160.

The previous prime is 28207979791. The next prime is 28207979837. The reversal of 28207979798 is 89797970282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28207979798² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28207979791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11391323 + ... + 11393798.

It is an arithmetic number, because the mean of its divisors is an integer number (5297540865).

Almost surely, 2^28207979798 is an apocalyptic number.

28207979798 is a deficient number, since it is larger than the sum of its proper divisors (14172347122).

28207979798 is a wasteful number, since it uses less digits than its factorization.

28207979798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22785742.

The product of its (nonzero) digits is 64012032, while the sum is 68.

The spelling of 28207979798 in words is "twenty-eight billion, two hundred seven million, nine hundred seventy-nine thousand, seven hundred ninety-eight".