28148434777 has 8 divisors (see below), whose sum is σ = 29861221536. Its totient is φ = 26441980992.

The previous prime is 28148434757. The next prime is 28148434799. The reversal of 28148434777 is 77743484182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28148434777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28148434757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1574083 + ... + 1591864.

It is an arithmetic number, because the mean of its divisors is an integer number (3732652692).

Almost surely, 2^28148434777 is an apocalyptic number.

It is an amenable number.

28148434777 is a deficient number, since it is larger than the sum of its proper divisors (1712786759).

28148434777 is a wasteful number, since it uses less digits than its factorization.

28148434777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166487.

The product of its digits is 8429568, while the sum is 55.

The spelling of 28148434777 in words is "twenty-eight billion, one hundred forty-eight million, four hundred thirty-four thousand, seven hundred seventy-seven".