28195586907 has 4 divisors (see below), whose sum is σ = 37594115880. Its totient is φ = 18797057936.

The previous prime is 28195586899. The next prime is 28195586917. The reversal of 28195586907 is 70968559182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28195586907 - 2³ = 28195586899 is a prime.

It is a super-2 number, since 2×28195586907² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28195586917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4699264482 + ... + 4699264487.

It is an arithmetic number, because the mean of its divisors is an integer number (9398528970).

Almost surely, 2^28195586907 is an apocalyptic number.

28195586907 is a deficient number, since it is larger than the sum of its proper divisors (9398528973).

28195586907 is an equidigital number, since it uses as much as digits as its factorization.

28195586907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9398528972.

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 28195586907 in words is "twenty-eight billion, one hundred ninety-five million, five hundred eighty-six thousand, nine hundred seven".