28154321077 has 4 divisors (see below), whose sum is σ = 28224531756. Its totient is φ = 28084110400.

The previous prime is 28154321071. The next prime is 28154321093. The reversal of 28154321077 is 77012345182.

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 21206931876 + 6947389201 = 145626^2 + 83351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28154321077 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 (28154321071) 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, 35104738 + ... + 35105539.

It is an arithmetic number, because the mean of its divisors is an integer number (7056132939).

Almost surely, 2^28154321077 is an apocalyptic number.

It is an amenable number.

28154321077 is a deficient number, since it is larger than the sum of its proper divisors (70210679).

28154321077 is an equidigital number, since it uses as much as digits as its factorization.

28154321077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70210678.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 28154321077 in words is "twenty-eight billion, one hundred fifty-four million, three hundred twenty-one thousand, seventy-seven".