28057691101 has 4 divisors (see below), whose sum is σ = 30608390304. Its totient is φ = 25506991900.

The previous prime is 28057691071. The next prime is 28057691111. The reversal of 28057691101 is 10119675082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28057691101 - 2⁵ = 28057691069 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 (28057691111) 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, 1275349585 + ... + 1275349606.

It is an arithmetic number, because the mean of its divisors is an integer number (7652097576).

Almost surely, 2^28057691101 is an apocalyptic number.

It is an amenable number.

28057691101 is a deficient number, since it is larger than the sum of its proper divisors (2550699203).

28057691101 is a wasteful number, since it uses less digits than its factorization.

28057691101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550699202.

The product of its (nonzero) digits is 30240, while the sum is 40.

The spelling of 28057691101 in words is "twenty-eight billion, fifty-seven million, six hundred ninety-one thousand, one hundred one".