28778230680 has 128 divisors (see below), whose sum is σ = 90942566400. Its totient is φ = 7265175552.

The previous prime is 28778230669. The next prime is 28778230681. The reversal of 28778230680 is 8603287782.

It is a super-2 number, since 2×28778230680² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778230681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4048009 + ... + 4055111.

It is an arithmetic number, because the mean of its divisors is an integer number (710488800).

Almost surely, 2^28778230680 is an apocalyptic number.

28778230680 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 28778230680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45471283200).

28778230680 is an abundant number, since it is smaller than the sum of its proper divisors (62164335720).

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

28778230680 is a wasteful number, since it uses less digits than its factorization.

28778230680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8913 (or 8909 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 28778230680 in words is "twenty-eight billion, seven hundred seventy-eight million, two hundred thirty thousand, six hundred eighty".