28778280800 has 72 divisors (see below), whose sum is σ = 73309589136. Its totient is φ = 11010813440.

The previous prime is 28778280733. The next prime is 28778280803. The reversal of 28778280800 is 808287782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778280803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 763619 + ... + 800418.

It is an arithmetic number, because the mean of its divisors is an integer number (1018188738).

Almost surely, 2^28778280800 is an apocalyptic number.

28778280800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28778280800 is an abundant number, since it is smaller than the sum of its proper divisors (44531308336).

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

28778280800 is a wasteful number, since it uses less digits than its factorization.

28778280800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564080 (or 1564067 counting only the distinct ones).

The product of its (nonzero) digits is 802816, while the sum is 50.

The spelling of 28778280800 in words is "twenty-eight billion, seven hundred seventy-eight million, two hundred eighty thousand, eight hundred".