28077694097 has 4 divisors (see below), whose sum is σ = 28326169380. Its totient is φ = 27829218816.

The previous prime is 28077694081. The next prime is 28077694123. The reversal of 28077694097 is 79049677082.

It is a Cunningham number, because it is equal to 167564²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 494795536 + 27582898561 = 22244^2 + 166081^2 .

It is a cyclic number.

It is not a de Polignac number, because 28077694097 - 2⁴ = 28077694081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28077694397) 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, 124237472 + ... + 124237697.

It is an arithmetic number, because the mean of its divisors is an integer number (7081542345).

Almost surely, 2^28077694097 is an apocalyptic number.

It is an amenable number.

28077694097 is a deficient number, since it is larger than the sum of its proper divisors (248475283).

28077694097 is a wasteful number, since it uses less digits than its factorization.

28077694097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248475282.

The product of its (nonzero) digits is 10668672, while the sum is 59.

The spelling of 28077694097 in words is "twenty-eight billion, seventy-seven million, six hundred ninety-four thousand, ninety-seven".