28191405407 has 16 divisors (see below), whose sum is σ = 31654164480. Its totient is φ = 24889269600.

The previous prime is 28191405367. The next prime is 28191405413. The reversal of 28191405407 is 70450419182.

It is a cyclic number.

It is not a de Polignac number, because 28191405407 - 2¹² = 28191401311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28191405467) 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 15 ways as a sum of consecutive naturals, for example, 212903 + ... + 318920.

It is an arithmetic number, because the mean of its divisors is an integer number (1978385280).

Almost surely, 2^28191405407 is an apocalyptic number.

28191405407 is a deficient number, since it is larger than the sum of its proper divisors (3462759073).

28191405407 is a wasteful number, since it uses less digits than its factorization.

28191405407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531974.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 28191405407 in words is "twenty-eight billion, one hundred ninety-one million, four hundred five thousand, four hundred seven".