28403353691 has 4 divisors (see below), whose sum is σ = 28505893152. Its totient is φ = 28300814232.

The previous prime is 28403353673. The next prime is 28403353703. The reversal of 28403353691 is 19635330482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19635330482 = 2 ⋅9817665241.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28403353691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28403353651) 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, 51269315 + ... + 51269868.

It is an arithmetic number, because the mean of its divisors is an integer number (7126473288).

Almost surely, 2^28403353691 is an apocalyptic number.

28403353691 is a deficient number, since it is larger than the sum of its proper divisors (102539461).

28403353691 is a wasteful number, since it uses less digits than its factorization.

28403353691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102539460.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 28403353691 in words is "twenty-eight billion, four hundred three million, three hundred fifty-three thousand, six hundred ninety-one".