28378828860 has 24 divisors (see below), whose sum is σ = 79460720976. Its totient is φ = 7567687680.

The previous prime is 28378828859. The next prime is 28378828873. The reversal of 28378828860 is 6882887382.

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 472980481 = 28378828860 / (2 + 8 + 3 + 7 + 8 + 8 + 2 + 8 + 8 + 6 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 28378828794 and 28378828803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236490181 + ... + 236490300.

It is an arithmetic number, because the mean of its divisors is an integer number (3310863374).

Almost surely, 2^28378828860 is an apocalyptic number.

28378828860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28378828860 is an abundant number, since it is smaller than the sum of its proper divisors (51081892116).

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

28378828860 is a wasteful number, since it uses less digits than its factorization.

28378828860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472980493 (or 472980491 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 60.

The spelling of 28378828860 in words is "twenty-eight billion, three hundred seventy-eight million, eight hundred twenty-eight thousand, eight hundred sixty".