28778418812 has 48 divisors (see below), whose sum is σ = 59655944544. Its totient is φ = 12074832000.

The previous prime is 28778418793. The next prime is 28778418817. The reversal of 28778418812 is 21881487782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778418817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138689 + ... + 277112.

It is an arithmetic number, because the mean of its divisors is an integer number (1242832178).

Almost surely, 2^28778418812 is an apocalyptic number.

28778418812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28778418812 is an abundant number, since it is smaller than the sum of its proper divisors (30877525732).

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

28778418812 is a wasteful number, since it uses less digits than its factorization.

28778418812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415851 (or 415827 counting only the distinct ones).

The product of its digits is 3211264, while the sum is 56.

The spelling of 28778418812 in words is "twenty-eight billion, seven hundred seventy-eight million, four hundred eighteen thousand, eight hundred twelve".