28978471877 has 8 divisors (see below), whose sum is σ = 29688977472. Its totient is φ = 28268143200.

The previous prime is 28978471853. The next prime is 28978471897. The reversal of 28978471877 is 77817487982.

It is a happy number.

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-28978471877 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 (28978471897) 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, 324602 + ... + 404132.

It is an arithmetic number, because the mean of its divisors is an integer number (3711122184).

Almost surely, 2^28978471877 is an apocalyptic number.

It is an amenable number.

28978471877 is a deficient number, since it is larger than the sum of its proper divisors (710505595).

28978471877 is an equidigital number, since it uses as much as digits as its factorization.

28978471877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88459.

The product of its digits is 88510464, while the sum is 68.

The spelling of 28978471877 in words is "twenty-eight billion, nine hundred seventy-eight million, four hundred seventy-one thousand, eight hundred seventy-seven".