28978178320 has 320 divisors, whose sum is σ = 87674388480. Its totient is φ = 8649897984.

The previous prime is 28978178303. The next prime is 28978178353. The reversal of 28978178320 is 2387187982.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 52976287 + ... + 52976833.

It is an arithmetic number, because the mean of its divisors is an integer number (273982464).

Almost surely, 2^28978178320 is an apocalyptic number.

28978178320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28978178320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43837194240).

28978178320 is an abundant number, since it is smaller than the sum of its proper divisors (58696210160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28978178320 is a wasteful number, since it uses less digits than its factorization.

28978178320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 976 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 28978178320 in words is "twenty-eight billion, nine hundred seventy-eight million, one hundred seventy-eight thousand, three hundred twenty".